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April 20, 2014

Search: why won't a regular octagon tessellate a plane by itself?

Number of results: 6,419

Geometry
The area of a regular octagon is 25. What is the area of a regular octagon with sides five times as large as the sides of the first octagon?
Thursday, April 7, 2011 at 10:41pm by Hannah

Geometry
the area of a regular octagon is 35 cm square. what is the area of a regular octagon with sides five times as long?
Monday, April 2, 2012 at 9:00pm by paul

Math
Why won’t a regular octagon tessellate the plane by itself? Describe a combination of a regular octagon and another regular polygon that will tessellate the plane.
Sunday, February 7, 2010 at 2:18pm by Crystal

Geometry
The area of a regular octagon is 35 cm. What is the area of a regular octagon with sides three times as long?
Monday, April 2, 2012 at 9:00pm by Samuel

geometry
An octagon has an internal angle of 135 degrees. If we put 2 octagons side-by-side, that makes 2*135=270°, leaving a gap of 90° which does not fit another octagon. Therefore we cannot tessellate with an octagon. Use the same logic with other regular polygons and you ...
Saturday, December 12, 2009 at 10:48pm by MathMate

geometry
The area of a regular octagon is 35 cm2. What is the area of a regular octagon with sides six times as long? so do you times this by 6?
Thursday, January 12, 2012 at 6:13pm by cindy

math
The perimeter of a regular octagon is p. write an expression that represents the length of one side of the octagon?
Wednesday, February 20, 2013 at 7:13pm by andrew

Trig-Algebra help asap
A regular octagon is inscribed in a circle with a radius of 5 cm. Find the area of the octagon.
Monday, March 12, 2012 at 8:50pm by Missy

geometry
The corners of the square, 2m. sides, are cut off to form a regular octagon. What is the length of the side of the resulting octagon?
Thursday, November 24, 2011 at 5:44am by Lian

geometry
The corners of the square, 2m. sides, are cut off to form a regular octagon. What is the length of the side of the resulting octagon?
Thursday, November 24, 2011 at 5:45am by Lian

geometry
The corners of the square, 2m. sides, are cut off to form a regular octagon. What is the length of the side of the resulting octagon?
Thursday, November 24, 2011 at 5:50am by Lian

geometry
The corners of the square, 2m. sides, are cut off to form a regular octagon. What is the length of the side of the resulting octagon?
Thursday, November 24, 2011 at 5:57am by Lian

geometry
The corners of the square, 2m. sides, are cut off to form a regular octagon. What is the length of the side of the resulting octagon?
Thursday, November 24, 2011 at 6:00am by Lian

geometry
The corners of the square, 2m. sides, are cut off to form a regular octagon. What is the length of the side of the resulting octagon?
Thursday, November 24, 2011 at 6:14am by Lian

geometry
The corners of the square, 2m. sides, are cut off to form a regular octagon. What is the length of the side of the resulting octagon?
Thursday, November 24, 2011 at 6:36am by Lian

geometry
The corners of the square, 2m. sides, are cut off to form a regular octagon. What is the length of the side of the resulting octagon?
Thursday, November 24, 2011 at 6:55am by Lian

geometry
The corners of the square, 2m. sides, are cut off to form a regular octagon. What is the length of the side of the resulting octagon?
Thursday, November 24, 2011 at 7:24am by Lian

Geometry
tha area of a regular octagon found by decomposing the octagon into a rectangle into trapezoids is ________ m2
Thursday, April 10, 2014 at 6:31am by David

jfk high school
if one side of a regular octagon is represented by 2x-1, the perimeter of the octagon can be represented by what?
Tuesday, November 22, 2011 at 1:01pm by gabby

math
A regular pentagon and a regular octagon cannot tessellate on their own correct?
Wednesday, June 9, 2010 at 4:48pm by april

math
An octagon has 8 sides. If this is a regular octagon then >> P = 8 * side P = 8 * 7.2
Tuesday, December 11, 2012 at 9:53pm by Ms. Sue

Math
Three is suppose to be rectangle and square, and six is either regular hexagon or regular octagon
Saturday, March 26, 2011 at 3:40pm by Rayna

math
How many sides does a regular octagon have, and what do we know about its sides and angles I think a octagon has 8 sides but I don't know about the angles...I'll go and look it up and if I find out I'll post it I found on wikipedia that it's internal angle's are 135o Check ...
Friday, August 3, 2007 at 1:34pm by Anonymous

trig
In a regular octagon, AB is a diagonal and CD joins the midpoints of two opposite sides. The side length of the octagon is 4 cm. To the nearest tenth of a cm. find a)AB and b)CD. I'm stumped.
Thursday, January 15, 2009 at 3:10pm by Cathy

Math
When I asked if this is right I mean is the answers A-F right. My answer are A: square, B: rhombus, C: equilateral triangle, D: regular hexagon, E: trapezoid, and F: regular octagon.
Saturday, March 26, 2011 at 11:51am by Rayna

geometry
The sum of the internal angles of a polygon of N sides is (180)*(N-2) degrees. For N = 8 (any octagon), the total is 6*180 = 1080 degrees, and in a regular octagon, each angle is 1/8 of that or 135 degrees. Set 4x + 12 equal to 135 and solve for x. The answer will not be an ...
Thursday, March 17, 2011 at 10:28pm by drwls

Math
why do you say that you still find two of the 6 when there is only one answer for it. I can only come up with either a regular hexagon or a regular octagon. A square, rhombus, trapezoid, and equilateral triangle does not work on these.
Saturday, March 26, 2011 at 11:51am by Rayna

maths
a regular dodecagon has a side lenght of 5.6cm find the side lenght of a regular octagon that has the same perimeter?
Tuesday, December 6, 2011 at 2:26pm by holly

Geometry
A Regular Octagon with apothem of 9ft
Thursday, April 15, 2010 at 3:17pm by Jena

geometry
if you have a regular octagon with a side 7, what is the area?
Thursday, January 22, 2009 at 10:31pm by aneme

Math
find the perimeter of a regular octagon with sides of 5.5cm.
Monday, October 18, 2010 at 4:13pm by Jerrry

Math
find the are of a regular octagon whose sides are 12cm long.
Sunday, May 25, 2008 at 6:44pm by Tareena

math
find the are of a regular octagon whose sides are 12cm long.
Monday, May 26, 2008 at 12:39pm by Tareena

geometry
what is the perimeter of a regular octagon whose sides are 9.4 centimeters long.
Wednesday, February 23, 2011 at 3:34pm by Aaron Penley

math
A square whose side is 2m has it's corner cut away so as to form a octagon with all sides equal find the length of each side of octagon and also find the area of the octagon?
Monday, September 10, 2012 at 8:15am by TUHITUHI

geometry
find the ara of a regular octagon inscribed in a circle with a radius of 1 cm.
Wednesday, March 5, 2008 at 9:31pm by ashley

geometry
find the ara of a regular octagon inscribed in a circle with a radius of 1 cm.
Wednesday, March 5, 2008 at 10:26pm by ashley

Geometry
(1) Construct a regular hexagon 55mm across the flat. Within it inscribe the largest possible isoscelence triangle having it base 40mm long across the flat. (2) Construct a regular octagon within the following direct 45mm across the flat, 50mm across the cornes. (3) construct ...
Saturday, March 31, 2012 at 4:04pm by Christopher

math
We would need to cut out four corners to make a regular octagon (all 8 sides of equal length) from the square. Each corner cut out will be an isosceles right-angled triangle with short sides of length x, and hypotenuse (√2)x. Since the hypotenuse forms one side of the ...
Sunday, January 9, 2011 at 4:22am by MathMate

geometry
if a regular octagon has a perimeter of 264 centimeters, what is the measure of each interior angle and each side?
Wednesday, February 24, 2010 at 10:22pm by Trevor

geometry
The measures of all angles in a regular octagon are (4x + 12). how would you find the value of x?
Monday, October 4, 2010 at 4:03pm by daerius

Algebra
What is the measure of each of the interior angles of these regular polygons? a) pentagon b) octagon c) dodecagon How would I figure this out?
Tuesday, March 10, 2009 at 3:36pm by Cassie

statistics
What is your conclusion based on the following data? A survey was conducted to study the effects of weight loss from a low fat diet. Two random samples of 100 people each were selected. One group was put on the low fat diet and the other group on the regular diet. The weight ...
Saturday, June 22, 2013 at 1:21pm by jerry

Math--Area
Find the area of each regular polygon to the nearest tenth. Octagon with side length of 10 kilometers. Heres what I tried; but I don't know if im on the right track. Area=1/2 * Perimeter* Apothem Perimeter=base of octagon* number of sides Perimeter=10*8=80 km. SO A=40a (1/2 of...
Wednesday, April 4, 2007 at 9:00am by natalie

Geometry
#19. Given a regular octagon, find the measures of the angles formed by (a) two consecutive radii and (b) a radius and a side of the polygon.
Tuesday, April 8, 2014 at 8:40am by Heather

Geometry
The measure of a single angle in a regular octagon is (4x + 12). Find the value of x. Show equations and all work that leads to your answer
Wednesday, January 5, 2011 at 1:14am by Clarissa

geometry
The measure of a single angle in a regular octagon is (4x + 12). Find the value of x. Show equations and all work that leads to your answer.
Thursday, March 17, 2011 at 10:28pm by Anonymous

Math
1 the mystery shape has at least 2 lines of symmetry 2 at least 1 of its diagonals is also a line of symmetry 3 it has has at least 1 obtuse angle 4 at least 3 of its angles are congruent 5 its total angle measure is between 100 degrees and 1,000 degrees A. square B. rhombus C...
Saturday, March 26, 2011 at 11:51am by Rayna

5th math
no, that's an octagon. a regular polygon has sides with equal lengths, and also with equal angles. :)
Thursday, October 28, 2010 at 8:33am by jai

math
an octagon has 8 sides. how many diagonal does an octagon have
Thursday, August 28, 2008 at 8:00pm by sophie

math **urgent**
using 100 ft of fence material and building a regular octagon garden, what is the area of the garden?
Monday, December 5, 2011 at 11:54am by Anne

Algebra
OOO I forgot the regular octagon has a square in the middle with four rectangles and four triangles. I'm not sure if that makes any sense
Tuesday, March 11, 2008 at 9:06pm by Bretagne

Geometry
The measures of all angles in a regular octagon are (4x + 12). Find the value of x. Show equations and all work that leads to your answer.
Thursday, January 13, 2011 at 4:57pm by Katheryn

geometry
The measures of all angles in a regular octagon are (4x + 12). Find the value of x. Show equations and all work that leads to your answer
Thursday, January 26, 2012 at 4:43pm by FlowerChild

geometry
A regular octagon has 8 equal sides P = sum of all the sides, or P = number of sides * length of side P = 8 * 9.4 P = ?
Wednesday, February 23, 2011 at 3:34pm by Helper

geometry
A square measures 18feet 6inches in length. If an octagon is inscribed in the square, then how long should each side of the octagon be?
Friday, July 15, 2011 at 11:28pm by Cathy

Geometry
Each INTERNAL angle of a regular octagon is 135 degrees. If 4x + 12 = 135, then 4x = 123 Divide both sides of the equation by 4.
Wednesday, January 5, 2011 at 1:14am by drwls

maths-urgently needed
Let the corners of the square be at (0,0),(1,0),(0,1),(1,1) y=1-2x intersects y=(1-x)/2 at (1/3,1/3) So, in each of 4 quadrants, the exterior of the octagon is a trapezoid and a triangle trapezoid has area 3/16 triangle has area 1/48 sum has area 5/24 The 4 have area 5/6 The ...
Tuesday, February 5, 2013 at 7:07am by Steve

math
if the cutout of each side is x, the side of the octagon is x√2. Also, 2x + x√2 = 2, so x = 2-√2 the octagon side s = 2(√2-1) check: 2(2-√2) + 2(√2-1) = 2 area of octagon with side s = 2s^2 (1+√2) so, for us, that is 2(1+√2)(2&#...
Monday, September 10, 2012 at 8:15am by Steve

maths-urgently needed
ABCD is a square with length of each side 1cm. An octagon is formed by lines joining the vertices of the square to the mid points of opposite sides. Find the area of the octagon?
Tuesday, February 5, 2013 at 7:07am by Anonymous

finance
The owners equity accounts for Octagon Transnational are as follows: Common Stock [$2 par value] $20,000 Capital Surplus 360,000 Retained Earnings 1,173,000 Total owners equity $1,553,000 a. If Octagons stock currently sells for $50 per share and Octagon declares a 10% ...
Thursday, May 5, 2011 at 8:15pm by Sara

Mathematics
A regular octagon is formed by cutting off the corners of a square. If one side of the square is n cm, find the total area removed in square cm.
Monday, August 12, 2013 at 8:19am by Arch

Math :(
A 7-sided figure is called a heptagon. A 7 sided figure cannot look like an octagon, an octagon has 8 sides!
Monday, March 15, 2010 at 3:46pm by Reiny

Math
Adam --- x apples Bob ---- y apples x+39 = 2y or x - 2y = -39 2x = y + 39 or 2x - y = 39 the first equation: x - 2y = -39 double the 2nd : 4x - 2y = 78 subtract them: 3x = 117 x = 39 into the 2nd: 78 - y = 39 -y = -39 y = 39 They each picked 39 apples.
Sunday, May 12, 2013 at 10:38pm by Reiny

geometry
Why is it impossible for a regular polygon with more than six sides to tesselate the plane? I know it has something to do with the angles, but I'm not sure what to write for this. 3 hexagons tesselate the plane and they have angles at 120, but why can't an octagon? Why is it ...
Saturday, December 12, 2009 at 10:48pm by Lauren

Algerbra
regular dinner = 2 tacos & 3 enchailada for 2.39 special dinner = 3 tacos & 4 enchiladas for 4.23 what is the average price for a taco & enchilada? Let t be tacos and e be enchiladas. A regular dinner would be represented as: 2t + 3e = 2.39 and a special dinner would be ...
Wednesday, January 10, 2007 at 8:02pm by Lea

geometry
ABCD is a square of side length 1. E , F , G and H are the midpoints of AB , BC , CD and DA , respectively. The lines FA , AG , GB , BH , HC , CE , ED and DF determine a convex 8-gon. By symmetry, this octagon has equal sides. If s is the side length of the octagon, then s 2 ...
Saturday, February 23, 2013 at 9:17am by Anonymous

math
There are four multiples of 9 and 9 multiples of four between 0 and 39. If each number is independently chosen from 0 to 39, the probability of what you describe is 4/39 x 4/39 x 9/39 = 144/55,319 = 0.002428 or about 1 in 412
Sunday, January 31, 2010 at 11:32pm by drwls

Math
300/768=0.39. 0.39*100=39% Small=39% of large.
Tuesday, November 4, 2008 at 12:12am by Anonymous

algebra
bzzt. Watch those signs. You meant to say -8(2t^2-39)= 0 2t^2-39 = 0 2t^2 = 39 t^2 = 39/2 t = √(39/2)
Wednesday, November 13, 2013 at 3:20pm by Steve

geometry
An interior decorator is buying a fringe for the edge of a rug in the shape of a regular octagon. The side length of the rug measures 1/2 inch on a diagram with a scale 1 inch to 4 feet. How many feet of fringe will be needed for the entire edge of the rug?
Thursday, January 26, 2012 at 7:40pm by Kaity

geometry
1. An exterior angle of a regular polygon measures 30 degrees. What is the measure of an interior angle? 30 60 120 150 2. How many degrees are in each interior angle of a regular pentagon? 50 72 108 120 3. If all of the diagonals are drawn from a vertex of a hexagon, how many...
Tuesday, November 30, 2010 at 2:16pm by Justin

Geometry
What is the sum of the measures of the interior angles of a convex octagon? What is the sum of the measures of the interior angles of a convex decagon? What is the measure of one interior angle of a regular polygon with 20 sides? Thank You! (:
Wednesday, February 3, 2010 at 12:12am by Alan

geometry
I'm thinking that since the octagon is made up of eight equal size triangles with one of the sides being 1 cm. Then find the area of one triangle which has all sides equal to 1 cm. then multiply answer by 8 and that should give you total area of octagon. hope this helps.
Wednesday, March 5, 2008 at 10:26pm by Samantha

college algebra
Reiny is correct for a regular octagon. In looking at the figure of http://en.wikipedia.org/wiki/Stop_sign I erroneously assumed that each pair of cut-off corners amounted to 1/9 of the square. That would amoount to $0.89 wasted.
Tuesday, April 26, 2011 at 8:40pm by drwls

math
A % sign means the number of parts of 100. So 39% is 39 parts out of 100 or 39/100. Move the decimal point two places to the left and omit the % sign. 39% = 0.39
Wednesday, January 30, 2008 at 10:16am by Ms. Sue

Computer Science
Question #1. 1. Say that L is regular over 0, 1. Is the set, {x|x = 0y,y ∈L } also regular? 2. For two regular languages (a) Is M*L=L*M for any alphabet? (b) Is it true if the alphabet is only {0,1}? (c) Is it true if the alphabet is only {0}? 3. If L is regular, is the ...
Saturday, November 3, 2012 at 11:32am by James

Physics
parallel plane: mgsin(39.5) - .330N = ma perpendicular plane: N - mgcos(39.5) = 0 <== because it is not accelerating perpendicular the plane so N = mgcos(39.5) therefore, parallel plane: mgsin(39.5) - .330(mgcos(39.5)) = ma m's cancel: gsin(39.5) - .33gcos(39.5) = a a = 3....
Wednesday, December 19, 2012 at 9:29pm by PhysicsPro

MATH
There are 8 sides on a stop sign - an octagon. The interior angles of any normal polygon can be found by 180(n-2)/n, where n is the number of sides. The number of sides of a stop sign (or an octagon) is 8. 180(8-2)/8 = ?
Thursday, August 20, 2009 at 3:27pm by Marth

Physics please help
Moment of inertia of the circular object is I =cmr^2 c=0.39 The potential energy at the height H is PE=mgH The total energy at height R is E=mgR+(1/2) Iω^2 +( 1/2) mv^2 = =mgR + (1/2) (0.39) mr^2 ω^2+(1/2) mv^2 = =mgR + (1/2) (0.39) mr^2 v^2/r^2...
Thursday, March 29, 2012 at 4:37pm by Elena

algebra
We know the trajectory is along the parabola y = 1.39 + ax + bx^2 and that y(18) = 1.684 y(45) = 0 So, 1.39 + 18a + 324b = 1.684 1.39 + 45a + 2025b = 0 a = 0.0478 b = -.00175 y = -.00175x^2 + .0478x + 1.39 max altitude is reached at (13.657,1.716)
Tuesday, November 5, 2013 at 11:02am by Steve

math
http://www.mathopenref.com/octagon.html
Wednesday, May 22, 2013 at 7:20pm by Ms. Sue

Geometry
To tessellate a regular polygon, the internal angle must be an integral factor of 360. A regular hexagon can tessellate with three corners at a point, the minimum. The internal angles of regular polygons with more than six sides will exceed 120. In fact, the only regular ...
Friday, December 11, 2009 at 10:37am by MathMate

Geometry
Area of octagon: A=2*[1+sqroot(2)]*a^2 A1=Area of first octagon A1=25 A2=Area of five time lager side octagon A1=2*[1+sqroot(2)]*a^2 A2=2*[1+sqroot(2)]*(5a)^2 A2=2*[1+sqroot(2)]*25*a^2 A2/A1=2*[1+sqroot(2)]*25*a^2/2*[1+sqroot(2)]*a^2= 25 A2/A1=25 A2=25*A1= 25*25= 625
Thursday, April 7, 2011 at 10:41pm by Anonymous

MATH I HAVE ASKED TWICE ALREADY!!!!!!!!!
http://www.ehow.com/how_5568543_figure-area-octagon.html
Tuesday, January 8, 2013 at 7:08pm by Ms. Sue

math
find the best buy on cashews a.12oz for $5.39 b.1lb4oz for $7.39 c.10oz for $4.89 d.1lb for $6.39 B)Is this correct
Wednesday, October 22, 2008 at 7:42pm by deedee

Algebra2
4a = 4b+12 a^2 = b^2+39 (b+3)^2 = b^2+39 b^2+6b+9 = b^2+39 6b=30 b=5 so, a=8 check: 4*8 = 32 = 4*5+12 8^2 = 64 = 5^2+39
Tuesday, September 10, 2013 at 8:21pm by Steve

Maths
If P is at (0,0) Q is at (38.04,12.36) R is at (39.32,-27.53) so, R-Q = (1.28,-39.89) the bearing,distance are 39.9km S150'W
Tuesday, March 19, 2013 at 10:46pm by Steve

MATH I HAVE ASKED TWICE ALREADY!!!!!!!!!
You don't have enough information. It is not enough to know the 8 sides, you must also be given some angles. An octagon is not a rigid shape. Imagine a stop sign, which is an octagon, where the corners are somehow hinged. You could squish the shape sideways and thus change the...
Tuesday, January 8, 2013 at 7:08pm by Reiny

math
1000-31^2=39 (n=31) 39=1*25+14*1 15 coins 39=3*10+9*1 12 coins 39=7*5+4*1 11 coins
Thursday, May 19, 2011 at 8:12am by Mgraph

Math
A perimeter is the distance around an object. For instance, the perimeter of a regular sheet of computer paper is 8.5 + 8.5 + 11 + 11 = 39 inches.
Saturday, October 18, 2008 at 9:59pm by Ms. Sue

math
5.is 3.671 less than 3.67 yes 6.A triangle has a base of 13 feet and an altitude of 7 feet. Find its area. 45.5 7.find the best buy on cashews a.12oz for $5.39 b.1lb4oz for $7.39 c.10oz for $4.89 d.1lb for $6.39 A. 12oz for $5.39 8.8gal7qt+3gal2qt= 6gal1qt
Wednesday, October 22, 2008 at 4:14am by deedee

algebra
2x^2 - 3x + 6 = 0. x = 3+- sqrt(9 - 48) / 4 = 3 +- sqrt(-39) / 4 = (3 +- sqrt(39*-1)) / 4 sqrt(-1) = i x = +- isqrt(39) / 4 Solution Set: x =(3 - isqrt(39)) / 4 x =(3 + isqrt(39)) / 4
Saturday, September 4, 2010 at 2:02pm by Henry

Geometry
A regular octagon forms 8 congruent isosceles triangles, where the central angles are 360/8 or 45 each. Your second part cannot be answered since you gave no data. Let the radius be r and consider one of the triangles.. If the base is 2s, then s/r = sin 67.5 s = r sin 67.5...
Tuesday, April 8, 2014 at 8:40am by Reiny

math
1. ((9*9+5)/9 = (81+5)/9 = 86/9 2. (6*39 + 23)/39 = (234 + 23)/39 = 257/39 3. 5 3/4 4. 19/4 * 8/7 = 34/7 5. 311/15 -52/3 = (311-260)/15 =51/15 =17/5 6. 0 7. P = 70
Tuesday, May 14, 2013 at 12:45am by SAM

5th grade math
divide and simplify 7/18 divided by 14/39 the first step is to change the recipricol which is 14/39 = 39/14 then multiply 7 x 39=273 18x14=252 the answer is 273/252 I am not good at simplifying big numbers can someone please help me?
Wednesday, September 9, 2009 at 4:49pm by Anonymous

Statisics
35%of adult Americans are regular voters. A random sample of 250 adults in a medium-size college town were surveyed, and it was found that 110 were regular voters. Estimate the true proportion of regular voters with 90% confidence and comment on your results... Can you show ...
Wednesday, October 5, 2011 at 11:54pm by tina

physics
Wb = mg = 4kg * 9.8N/kg = 39.2N = Weight 0f block. Fb = 39.2N@0deg. Fp = 39.2sin(0) = 0 = Force parallel to surface. Fv = 39.2cos(0) = 39.2N. = Force perpendicular to surface. Fap - Fp - Ff = 0, 20 - 0 - Ff = 0, Ff = 20N. = Force of friction. u = Ff / Fv = 20 / 39.2 = 0.510...
Wednesday, October 26, 2011 at 2:43pm by Henry

chemistry
That looks ok to me but I would have used 39.9 for Ar. Ar is 39.948 which rounds to 39.9 instead of 40.
Tuesday, January 6, 2009 at 10:03pm by DrBob222

Physics/Algebra
So what is your question? I'm assuming you want to know the height of the fountain. C = 6.28r = 250m, r = 250 / 6.28 = 39.8m. tan74 = h/r = h / 39.8 h = 39.8tan74 = 138.8m.
Sunday, August 14, 2011 at 5:40pm by Henry

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