Friday
April 18, 2014

Search: bc

Number of results: 1,934

algebra
Sorry, in general, a+(bc+2) ≠ 2a(b+c) However, a+(bc+2) =(a+bc)+2 =(a+2)+bc
Monday, May 9, 2011 at 9:38am by MathMate

MATH
Find AC? I assume you have a typo above? BC = BA + AC 5x - 3 = 2x + 5 + AC 3x - 8 = AC since A is the MP of BC and BA = 2x + 5 BC = 2(BA) BC = 2(2x + 5) BC = 4x + 10 BC = BC 5x - 3 = 4x + 10 x = 13
Sunday, January 16, 2011 at 7:05pm by helper

Physics
suppose that the separation between speakers A and B is 5.80 m and the speakers are vibrating in phase. They are playing identical 135 Hz tones, and the speed of sound is 343 m/s. What is the largest possible distance between speaker B and the observer at C, such that he ...
Tuesday, May 1, 2007 at 9:05pm by Mary

MATH
A is the midpoint of BC. BA=2x+5 and BC=5x-3. solve for x and find the length of BC
Sunday, January 16, 2011 at 7:05pm by BOB

Algebra
-b+bc-c^3-(c^3+bc-c^3+b)= =-b+bc-c^3-bc-b= =-2b-c^3
Friday, March 16, 2012 at 12:08pm by Susan

addition of monomials
-27 bc 85 bc -30 bc
Monday, November 20, 2006 at 8:09pm by rose an

Geometry-8th gr
or, using the angle bisector theorem, AD/DC = AB/BC so, as Reiny calculated, AB/BC = 5/7 AD+BC = 84 5x+12x=84 x=7 so, AB = 35 BC = 49
Friday, February 1, 2013 at 12:12pm by Steve

chemistry
from UCI!!!!! 1 is equal bc of equilibrium 2 is endothermic bc of absorbing heat 3 is absorb....bc it is endothermic yay all finish!
Monday, January 25, 2010 at 11:01pm by Alex Le

solid mensuration
The circle radius is 5 cm. That comes from the area. The triangle ACB is a right triangle with AB as a diameter. The length of AB is 10 cm, since it is a diameter (AC)^2 + (BC)^2 = (AB)^2 = 100 Area = (1/2)(AB)*(BC) = 11 (AC)*(BC) = 22 (BC)=22/(AC) (AC)^2 + 484/(AC)^2 = 100 ...
Saturday, December 1, 2012 at 7:13am by drwls

math
Assume the 2x2 matrix to be A= \ a b c d Do the matrix multiplication AA and equate each element to A, a=a²+bc b=b(a+d) c=c(a+d) d=bc+d² From which we conclude a+d=1 or a=1-d and bc = a-a² = d-d² Take a=4, then d=-3 bc=4-4²=-12, If b=2, c=-6 So 4 2 -6...
Thursday, November 25, 2010 at 3:56pm by MathMate

algebra
(bc^2)-^2 Do you mean, (bc^2)^-2 (bc^2)^-2 = b^-2 c^-4 = 1/(c^4 b^2)
Saturday, February 5, 2011 at 5:46pm by helper

Algebra - REINY
Hi - Do you think this is correct? BC = AD Area of Rectangle = (FB+AF).BC Area of Rectangle = 72 units squared Area = 1/2 bh Area 1 = 1/2 FB.BC Area 2 = 1/2 AF.AD 1/2 = AF.BC A1 + A2 = 36 units squared 1/2 FB.BC + 1/2 AF.BC 1/2 [FB.BC + AF.BC] 1/2 [BC (FB + AF) 1/2.72 units ...
Thursday, March 7, 2013 at 7:19am by Anthony

11th grade
Angle A=45, AB=10, and BC=8. This is an SSA configuration which could result in 0, 1 or two distinct triangles, depending on the length of the "dangling" leg BC, i.e. the side which does not touch the given angle A. To determine which case applies, we construct a triangle ...
Thursday, June 3, 2010 at 10:08pm by MathMate

Math - explanation
This is an example in the text book. Using vectors, demonstrate that the three points A(5, -1), B(-3,4) and C(13,-6) are collinear. Solution AB = (-8, 5) BC = (16, -10) Then BC = 2AB AB and BC have the opposite direction, so the points A, B, and C must be collinear. I don't ...
Saturday, March 29, 2008 at 4:42pm by Anonymous

Geometry-7th grade
All sides of a Rhombus are congruent. Therefore, AB = BC = CD = AD BC = x + 9 DC = 5x - 2 BC = DC x + 9 = 5x - 2 4x = 11 x = ?
Monday, February 21, 2011 at 1:37pm by Helper

Physics, please help
Distruive interference? Unless you put C in the line between A and B, this the asnwer is at infinity. Now on the line between A and B, the distance from A to C has to be an odd multiple of halfwavelength greater than C to B. Now, the distance between the speakers is two ...
Friday, May 4, 2007 at 4:04am by Papito

Angle question
Quadrilateral JKLM is a rhombus. If mangleLMK = 36, find mangleKJM In the right triangle ABC, mangleB = 90, AB = 5, and AC= 12. Find BC. Round to the nearest tenth, if necessary. Help? Is AB a side and AC a side? I can't tell from your description which are sides and which is ...
Monday, August 21, 2006 at 8:14pm by Rachel

chemistry
Well i believe it is bc H20 needs alot of energy to bc a gas bc of the molecular bonds on it, while CO2 requires less energy to become a gas so that is why it becomes a gas at room temp
Tuesday, November 25, 2008 at 12:39am by Steven

math
AB/XY = BC/YZ, 5/35 = BC/70, Multiply both sides by 70: BC = 70*5/35 = 10 cm.
Monday, April 25, 2011 at 7:42pm by Henry

physics
Pascal’s principle F1/A1=F2/A2. F(bc)={A(bc)/A(mc)}•F(pedal) = =(1.83/6.32) •49 =14.2 N This is the normal force exerted on the brake shoe. The frictional force is F(fr) =μ F(bc)=0.442•14.2 =6.3 N
Friday, November 30, 2012 at 12:16pm by Elena

geometry help!!
oops. hit wrong key. 24*AB = 7*BC but AB+BC = 124/2 = 62, so 24(62-BC) = 7BC BC = 48 AB = 14 Area = 24*14 = 7*48 = 336
Wednesday, March 13, 2013 at 4:36pm by Steve

Math
Are the sides of triangle BCE, BC, BE and EC ? In rectangle ABCD, is side BC opposite to side AD? If so, AD = BC = 3 If so, since BCE is an equilateral triangle, (all three sides equal)therefore BE = BC = EC = 3. I don't have the advantage of seeing the diagram you are, so you...
Tuesday, January 25, 2011 at 7:51pm by helper

math
<<c is the midpoint of bc,bc=12, >> Are you sure you copied that question correctly? c should be an endpoint of bc. I can see how d might be the midpoint.
Friday, March 2, 2012 at 8:04pm by drwls

probability
PROBLEM 2: SET OPERATIONS AND PROBABILITIES (3 points possible) Find the value of P(A∪(Bc∪Cc)c) for each of the following cases: The events A, B, C are disjoint events and P(A)=2/5. P(A∪(Bc∪Cc)c)= incorrect The events A and C are disjoint, and P(A)=1/2 ...
Friday, February 7, 2014 at 4:10pm by JuanPro

math b
A median is a line joining the a vertex to the mid-point of the opposite side. If the median is also an altitude to side BC, then the median should be perpendicular to BC. Let D be the mid-point of BC. The coordinates of D should be rather obvious, being the mid-point of ...
Monday, May 25, 2009 at 1:44pm by PC

Please help with a trapezoid - circle problem
Correction: AB = CD = 10. h = Diameter = 2*3 = 6=Ht. or altitude. Draw altitudes CE and BF Draw diagonal CF which bisects BCE and BFE. Therefore, CFE = 45o tan45 = h/BC = 6/BC BC = 6/tan45 = 6. = Shortest base.
Monday, February 18, 2013 at 7:01pm by Henry

math
easiest way: list the points in a column, repeat the one you started with 2 3 -2 -4 3 4 2 3 area = (1/2)[ sum of downproducts - sum of up-products] = (1/2)[-8 -8 + 9 - (-6 -12 +8) ] = (1/2)( -7 + 10] = 3/2 or label the points A(2,3) , B(3,4) and C(-2,-4) BC = √(25 + 64...
Saturday, October 13, 2012 at 11:27am by Reiny

math
given that a/b = c/d then ad = bc now divide both sides by cd to get a/c = b/d as required or if we cross - multiply the first we had ad = bc if we cross-multiply a/c = b/d we also get ad = bc so it it true.
Tuesday, May 26, 2009 at 1:01pm by Reiny

Geometry
Did you make a sketch? On my diagram length(BC) = length(AC) - length(AB) = 12x-2 - (5x+2) = 7x-4 but B is the mipoint, so AB = BC 7x-4 = 5x+2 2x = 6 x = 3 then BC = 7(3)-4 = 17 check: AB = 17 AC = 12(3)-2 = 34 BC = 17 , YUP!!
Thursday, July 1, 2010 at 11:11pm by Reiny

Trig-Medians and law of cosines and sines
In triangle ABC, we have AB=3 and AC=4. Side BC and the median from A to BC have the same length. What is BC? Not making sense to me, I think the answer must be simple, but I don't know how to solve I applied the law of sines but to no avail. Help is appreciated, thanks.
Wednesday, November 20, 2013 at 11:53am by Sam

math
ive been working on my sat's and i cant seem to figure out how to answer the following question. a right angle is given. the length of ba is 20. what is the approx length of bc? sin= .643 cos= .766 tan= .839 the answer is 12.9 but i dont know how that is. I assume bc is the ...
Saturday, July 14, 2007 at 5:23pm by bart

geometry
since B is the midpoint of line AC, that means AB=BC set AB=BC 12x-5=4x+15 find x. plug x into 4x+15 to find BC.
Monday, September 13, 2010 at 3:48pm by Anonymous

math
c is the midpoint of bc,bc=12, and cd 4x-8 what is the value of x
Friday, March 2, 2012 at 8:04pm by Anonymous

Geometry
BC has endpoints B(5,9) and C(-4,-3). Find the coordinates of the midpoint of BC.
Tuesday, November 6, 2012 at 4:16pm by Mark

foundations of geometry
find y and bc if b is between a and c ab=6y, bc=12y
Wednesday, October 20, 2010 at 1:44pm by benjimn

geometry
If b is between A and C, find the value of "x" and BC. AB=3(x+7),BC=2(x-3),and AC=50
Monday, September 22, 2008 at 11:22pm by taz manian

math
multipy all terms by abc bc+ac=ab bc=a(b-c) solve for a
Monday, May 24, 2010 at 9:55pm by bobpursley

geometry
if b is between a and c find the value of x and the measure of bc (ab=3x,bc=5x,ac=8)
Friday, November 19, 2010 at 5:25pm by B

geometry
If B is between A and C, AB=3x-1, BC=2x+4 and AC=38, what is the value of BC?
Friday, January 28, 2011 at 2:58pm by octavia

Gemotry
A(2,4) , B(3,1), C(15,7). The altitude is perpendicular to BC. Therefore, it's slope is the negative reciprocal of BC. m = (7-1) / (15-3) = 6/12 = 1/2=slope of BC. m2 = -2/1 = -2 = Slope of altitude.
Sunday, July 24, 2011 at 2:43pm by Henry

geometry
ab=3x, bc=5x, ac=8 what is x and bc?
Friday, September 10, 2010 at 10:10pm by C

Algebra
Simplify...Show work...-b+bc-c^3-(c^3+bc-c^3+b)
Friday, March 16, 2012 at 12:08pm by sherry

trignometry
Since you posted this twice, I think you realized that the symbols did not come out like you intended. I think you meant this: AB = 8, angle A = 60° then you are given sin60° = .866 cos60° = .5 tan60° = 1.73 the problem is that we don't know where the 90° angle is, could be at...
Wednesday, April 24, 2013 at 11:57pm by Reiny

geometry
If b is between A and C, find the value of "x" and BC. AB=3x,BC=5x,and AC=8
Monday, September 22, 2008 at 11:21pm by taz manian

geometry
B is the midpoint of line AC. If AB = 12x-5 and BC = 4x + 15. Find x and BC.
Monday, September 13, 2010 at 3:48pm by Anonymous

geometry
IF AB = 15 and AC =23,find the length of BC (BC has a line over it)
Wednesday, September 14, 2011 at 6:15pm by Diane

geometry
what is the value of the variable and bc if b is between a and c if AB=17, BC=3m, AC=32
Thursday, October 31, 2013 at 6:46pm by Anonymous

geometry
It should be easy to see that AB = AC = AD let each one be x in triangle ADC 2x + 7 = 51 2x= 44 x = 22 in triangle ABC 2x + BC = 59 44 + BC = 59 BC = 15
Monday, April 15, 2013 at 4:19am by Reiny

Math
Foil Left side gives you: = a^2c^2 + a^2d^2 + b^2c^2 + b^2d^2 = (ac)^2 + (ad)^2 + (bc)^2 + (bd)^2 Foil Right side (ac+bd)^2 = ac x ac + ac x bd + ac x bd + bd x bc = (ac)^2 + 1acbd + 1acbd + (bd)^2 Foil (ad-bc)^2 = ad x ad - bc x ad - bc x ad + bc x bc = (ad)^2 - 1acbd - 1acbd...
Friday, January 11, 2013 at 11:05am by Math Teach

math
If you were finding slope, then you have it upside down. slope AB = (-2 + 1)/(4+2) = -1/6 slope of BC = (3+1)/(4+2) = 4/6 = 2/3 equation of BC y-3 = (2/3)(x-4) 3y - 9 = 2x - 8 2x - 3y + 1 = 0 distance from A(4,-2) to BC = |2(4) - 3(-2) + 1|√(2^2 + (-3)^2) = 15/√13
Wednesday, November 23, 2011 at 2:09pm by Reiny

math
did you mean A vavies with BC or A varies directly with BC, if so, then a. A = kBC so, 6 = k(4)(9) k = 6 then A = 6BC b. A = 6(3)(10) = 180 c. 20 = (6)(15)C C = ......
Monday, September 1, 2008 at 5:19pm by Reiny

trig
ABC is an isoscele triangle in which [AB]=[AC]=5cm and [BC]=6cm. Calculate [AM], where M is the mid-point of BC.
Saturday, March 26, 2011 at 7:22pm by ezendu

maths
Locate points on the ocean: Let the point at 30 degrees be A Let the point at 60 degrees be B Let the base of the lighthouse be point C Let the height of the lighthouse be h h/BC = tan 60 = √3 h/AC = tan 30 = 1/√3 √3 BC = 1/√3 AC 3BC = AC That means AC...
Tuesday, November 8, 2011 at 4:14am by Steve

Math
In triangle ABC, D and E are midpoints of AB and AC, DE=4x and BC=2x+48. Find BC. Thanks So Much!!
Saturday, May 21, 2011 at 10:28pm by Alana

maths
so, we want to show that ab+bc+ca <= (a^2+b^2+c^2) since all squares are positive, 0 <= (a-b)^2 + (a-c)^2 + (b-c)^2 0 <= a^2-2ab+b^2 + a^2-2ac+c^2 + b^2-2bc+c^2 0 <= 2(a^2+b^2+c^2) - 2(ab+ac+bc) ab+ac+bc <= a^2+b^2+c^2 This is in fact true for any three real ...
Thursday, February 14, 2013 at 12:43pm by Steve

math
ahh, that's better make a sketch of a line and label point A, B, C, and D using CD : AB = 5:2 label AB = 2x and CD = 5x , giving you the 5:2 ratio From AC = 25 you can now label BC as 25-2x From BD = 46 you can label BC as 46-5x so obviously 25-2x = 46-5x x = 7 sub back in ...
Wednesday, October 6, 2010 at 11:57am by Reiny

maths
Triangle ABC has an obtuse angle at B, base BC has length equal to 30 and height equal to 24. (This height is taken with respect to base BC). D is a point on the line segment BC and E is a point on AC such that DE∥AB. F is a point on AB such that FD∥AC. As D varies...
Saturday, June 8, 2013 at 4:15am by keshav

geometry
Please use this for the portfolio. You will need graph paper. 1. Start with Triangle ABC with vertices: A(0,2), B(2,5), C(3,0) 2. Find slope of side AB and BC 3. Now TRANSLATE the Triangle 4 units left, and 2 units up (x-4,y+2) and give the new vertices to find A', B', C' 4. ...
Monday, April 7, 2014 at 4:44pm by brit

Math - vector equation of a parallelogram
Sure, we can find the vector equations of those lines, but I hesitated since you called it a parallelogram, which it isn't. let's find vector equation for line BC direction vector of BC is [4,-4] or simplified to [1,-1) a point on there is {3,6) equation for BC: [x,y] = (3,6...
Sunday, September 5, 2010 at 11:23pm by Reiny

Trigonometry
sin 75 = .5 BC/15 BC = 30 sin 75 and sorry used trig (have no idea how to do it without trig) to get exact .5 BC/15 = cos 15 so BC = 30 cos 15 cos 15 = sqrt ( [1+cos 30]/2 ) but cos 30 = .5 sqrt 3 so BC = 30 sqrt ( [ 1 + .5 sqrt 3]/2 )
Saturday, December 1, 2012 at 8:39pm by Damon

geometry
ABC is a triangle with AC=139 and BC=178. Points D and E are the midpoints of BC and ACrespectively. Given that AD and BE are perpendicular to each other, what is the length of AB?
Monday, June 24, 2013 at 1:08pm by stranger

Math
Consider a line segment with endpoints A and C with B a point on segement AC. The measure of AB = x^2, the measure of BC = 9x, and the measure of AC = 36. Then AB + BC = AC x^2 + 9x = 36 x^2 + 9x -36 = 0 (x + 12)(x - 3) = 0 x + 12 = 0 or x - 3 = 0 x = -12 x = 3 Don't use x = -...
Tuesday, November 4, 2008 at 12:26pm by Margie

maths
If ABC is a triangle with AB=20,BC=22 and CA=24. Let D lie on BC such that AD is the angle bisector of ∠BAC. What is AD2?
Sunday, June 23, 2013 at 8:18am by Anonymous

geometry
Just lay out the points on the line BD contains the right half of BC and the left half of CE So, what's left is the same length: The left half of AC and the right half of CE AE = AB + BC + CD + DE but BD = BC + CD = 14 so, AE = AB + 14 + DE However, AB = BC and CD = DE so AB+...
Sunday, December 11, 2011 at 7:20pm by Steve

math help mepls
Triangle ABC has an obtuse angle at B, base BC has length equal to 30 and height equal to 24. (This height is taken with respect to base BC). D is a point on the line segment BC and E is a point on AC such that DE∥AB. F is a point on AB such that FD∥AC. As D varies...
Friday, June 7, 2013 at 5:47am by clavin

geometry
Since CD is BOTH the median and altitude, the triangle is isosceles and AB is the short side. The 2 long sides(AB and BC) are equal. AB = BC, 2X + 8 = 3X + 5, 2X - 3X = 5 - 8, -X = -3, X = 3. P = AB + AC + BC, P = (5X + 3) + (2X + 8) + (3X + 5), P = (5*3 + 3) + (2*3 + 8) + (3*...
Monday, October 4, 2010 at 5:16pm by Henry

Geometry Check
To be collinear, line segments have to be parallel, and a point must be common for your choice slopeAB=1/3, slope BC=1/2 so they are not parallel b) slopeAB = 3/(1/2) = 6 , slope BC = 2/(1/2) = 4 not parallel c) slopeAB = -2/4 = -1/2 , slope BC = -1/2 so the correct choice is c)
Saturday, June 12, 2010 at 12:02am by Reiny

Geometry
You are dealing with the intersection of the three altitudes, which is the orthocentre. The third altitude, from B to the x-axis will definitely hit the midpoint of AC. The others will only hit the midpoint of AB and BC if the triangle is equilateral. for that to happen AB = ...
Sunday, November 30, 2008 at 1:39pm by Reiny

Math
B is between A and C. If AB=x squared, BC=9x and AC=36, find the value(s) of x, AB, and BC.
Tuesday, November 4, 2008 at 12:26pm by Abbey

geometry
ab+bc=ac 3x+5x=8 8x=8 x=? bc=5x Put what you got for x in and solve.
Friday, September 10, 2010 at 10:10pm by Jen

geometry
The perimeter is 68. Find x,an,BC,AC.if ab is 2x+7,bc is 3x+5, and ac is 5x-4
Wednesday, October 6, 2010 at 9:43pm by chance

AD or BC?
BCE means Before the Common Era. It's the same as BC (before Christ).
Thursday, December 13, 2012 at 9:20pm by Ms. Sue

St francis
Abcd is a quadrilateral such that AB = bc, ad= 1/4am. If bc 12 what is the perimeter of abcd
Wednesday, February 6, 2013 at 12:39am by MAggie

geometry
Trapezoid ABCD has height 4, BC=5, and AD and BC are perpendicular. Find the area of the trapezoid.
Sunday, February 13, 2011 at 10:12pm by sally

geometry
Trapezoid ABCD has height 4, BC=5, and AD and BC are perpendicular. Find the area of the trapezoid.
Sunday, February 13, 2011 at 10:13pm by sally

Geomatry
What is the value of the variable and BC if B is between A and C. AB=4x BC=5x AB=16
Tuesday, September 13, 2011 at 7:36pm by Chase

geometry
What is the value of the variable and bc if b is between a and c. Ab=4x,bc=5x;ab=16
Saturday, October 1, 2011 at 12:59pm by kelvyn

Math
ABCD is a parallelogram. E is a point on DC extended, such that D and E are on opposite sides of BC. Let AE intersect BC and BD at F and G, respectively. If AG=180 and FG=108, what is EF?
Monday, May 20, 2013 at 3:00am by John

maths
ABCD is a parallelogram. E is a point on DC extended, such that D and E are on opposite sides of BC. Let AE intersect BC and BD at F and G, respectively. If AG=180 and FG=108, what is EF?
Wednesday, May 22, 2013 at 8:00am by hemant

Math
figure side lengths, then use the law of cosines. AB^2 = 25 BC^2 = 40 AC^2 = 85 AC^2 = AB^2 + BC^2 - 2*AB*BC*cosABC 85 = 25+40-2√1000 * cosABC <ABC =~ 109°
Friday, August 31, 2012 at 1:49am by Steve

Music
c cc c bc cbc be bc cccccbcd ee ee eeff f (repeat)
Friday, March 27, 2009 at 5:18pm by bobpursley

geometry
AB + BC = AC (2x-1)+(4x+2)=25 x=4 AB = 2(4)-1 = 7 BC = 4(4)+2 = 18
Sunday, October 2, 2011 at 2:50pm by Kyle

maths
tan30=6/BC OR,BC=6/TAN30 =6/1/ROOT3 =6X1.732 =10.392
Monday, January 14, 2013 at 10:30am by karuna

Trigonometry
Make a sketch. I have a triangle ABC, where BC is the ground, AC is the tower. Angle B = 60°, angle C = 84.5°, making angle A = 35.5° by Sine Law: BC/sin 35.5° = 179/sin 60° I get BC = 120.026 So the shadow of the tower is 120 ft long
Tuesday, August 30, 2011 at 10:55pm by Reiny

math b
the vertices of triangle ABC are A(-2,3), B(0,-3), and C(4,1). prove, by means of coordinate geometry, that the median to side BC is also the altitude to side BC.
Monday, May 25, 2009 at 1:44pm by jojo

math
Let ABC be a triangle such that angle ACB = 135 degrees. Prove that AB^2 = AC^2 + BC^2 + ¡Ì2 x AC x BC.
Saturday, August 7, 2010 at 1:37am by mathsen

geometry
In triangle ABC, if line BC is one inch longer than line AB, line AC is 10 inches shorter than the sum of line BC and line AB , and the perimeter of triangle ABC is 72 inches, find the length of line BC?
Wednesday, November 3, 2010 at 10:14pm by meghan

maths --plse help me..
without using set square or protacter construct 1. triangle A BC WITH AB = 5.5 CM , BC = 3.2 CM CA = 4.8 CM 2. DRAW LOCUS OF A POINT WHICH MOVES SO THAT IT IS ALWAYS A DISTANCE OF 2.5 CM FROM B. 3. DRAW LOCUS OF POINT SO THAT IT IS EQUIDISTANT FROM BC & CA . 4. MARK POINT OF ...
Friday, December 28, 2012 at 11:43am by Anonymous

Physics. Please help!!
Distruive interference? Unless you put C in the line between A and B, this the asnwer is at infinity. Now on the line between A and B, the distance from A to C has to be an odd multiple of halfwavelength greater than C to B. Now, the distance between the speakers is two ...
Friday, May 4, 2007 at 3:14pm by papito

Math
Trigonometry problem: The sides AB and AC of triangle ABC are of lengths 4 and 7 respectively. M is the midpoint of BC. AM is of length 3.5, Find the length of BC.
Saturday, July 23, 2011 at 3:59am by Kalia

maths
let A = (h,k). Then B=(h+2(3-h),k+2(5-k))=(6-h,10-k) C=(h+2(-3-h),k+2(-3,k))=(-6-h,-6-k) BC^2 = 12^2+16^2 = 340 BC=√340
Thursday, January 3, 2013 at 8:59am by Steve

Mathsssssssssssss
Middle of BC is ( (1+5)/2 , (-3+7)/2) ) or (3,2) is point M so line through (-3,1) and (3,2) I bet you can find that line. Then line through M perpendicular to BC slope of BC = 10/-4 = -5/2 so slope we want = 2/5 so line with m = 2/5 that goes through (3,2) I bet you can do ...
Monday, October 4, 2010 at 1:03pm by Damon

math
AC*AD = 80, so AC = 20 AD=CE=4 CE*BC/2 = 30, so BC=15 AB+BC=20, so AB=5
Sunday, January 12, 2014 at 4:35pm by Steve

Math - Geometry
If more than one plane contains three points A,B, and C, what must be true? A)AB is perpendicular to BC B)A,B, and C are noncollinear C)A,B, and C are collinear D)AB=BC
Wednesday, December 23, 2009 at 2:29pm by Thamara

precal
draw a horizontal line from B to where it intersects the building wall. Call that point C. Label the top of the building A, and the bottom D. The height of the building is thus AD = AC + CD AC/BC = tan 43° CD/BC = tan 7° Now, you see that without knowing the distance BC, there...
Sunday, July 15, 2012 at 9:47pm by Steve

MATH
1. Let triangle ABC be a triangle such that angle ACB is 135 degrees. Prove that AB^2 = AC^2 + BC^2 - (Root 2) x AC x BC There is probably an error in the sign, because the result is obtained directly by application of the cosine law, and substituting cos(135°)=-√2 ...
Saturday, August 21, 2010 at 12:27pm by MathMate

geometry
line BC in one side of a regular n-gon. the sides next to line BC are extended to meet at point W. Find the measure of angle W in terms of n.
Monday, October 10, 2011 at 10:44pm by Anonymous

maths
ABCD is a rectangle with AB=26, BC=11. X, Y and Z are points on AB, BC and CD, respectively, such that AX=BY=CZ=6. What is the area of triangle XYZ?
Wednesday, May 8, 2013 at 7:02am by hemant

math
If ABC is a triangle with AB=20,BC=22 and CA=24. Let D lie on BC such that AD is the angle bisector of ∠BAC. What is AD^2?
Monday, June 17, 2013 at 2:53pm by jack

math
ABC is a triangle with AC=139 and BC=178. Points D and E are the midpoints of BC and AC respectively. Given that AD and BE are perpendicular to each other, what is the length of AB?
Tuesday, June 25, 2013 at 5:22am by anonymous

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