Posted by Ariel on Thursday, June 10, 2010 at 11:40pm.
***I know I've posted this several times but it's like getting skipped and or no one has gone over it so I'm posting it one more time before I go to bed. I need to have these checked by tommorrow PLEASE!***
Out of 31 questions these are ones I struggled with. after the = sign is what I think the answer( except for #4, I don't know what to do at all), is so if I'm wrong can someone correct it with an explanation/formula with it please?
1.) Find the area of the parallelogram. ( base(s)=10cm, side length(s)=6cm, height=? and the angle of elevation=60'
a.)15âˆš3 cm^2
b.)30âˆš3 cm^2
c.)15âˆš2 cm^2
=30âˆš3 cm^2
2.) What is the length of the radius of a circle with the center at O(3,4) and passes through the point P(2,5)?
a.)9
b.)12.5
c.)10.3
=9
3.) What is the equation for a circle with a diameter having the following endpoints: N(0,1) and Q(18,1)?
a.)(x  9)^2 + (y  1)^2 = 81
b.)(x)^2 + (y)^2 = 72
c.)(x + 2)^2 + (y  7)^2 = 56
=(x)^2 + (y)^2 = 72
4.) Using coordinate geometry to prove that the diagonals of a square are perpendicular to each other.
Given: Vertices are at A(0,0), B(a,0), C(a,a) and D(0,a) Slope of AC=1; Slope of BD=1
Type your proof into the text box below.
=

Plz Check my Geometry (Urgent)  MathMate, Thursday, June 10, 2010 at 11:52pm
1. correct
2. R=√((32)²+(4(5))²)
=10.3
3. If the endpoints are (0,1) and (18,1), it means that the circle's diameter passes through theses two points.
Therefore the diameter is(180)=18, radius is 9.
The centre is ((0+18)/2, (1+1)/2)=(9,1).
The standard equation of a circle with radius r and passing through (x1,y1) is
(xx1)²+(yy1)²=r&su2p;
Therefore the answer is
(x9)²+(y1)²=9²
4. The product of the slopes of two lines intersecting at right angles is 1. You can take it from here.

Plz Check my Geometry (Urgent)  Ariel, Friday, June 11, 2010 at 10:36am
Thanks:)

Plz Check my Geometry (Urgent) :)  MathMate, Friday, June 11, 2010 at 11:30pm
Glad to be of help!

Plz Check my Geometry (Urgent)  Anonymous, Friday, November 19, 2010 at 9:23am
Find the area of a parallelogram with sides of 6 and 12 and an angle of 60°.
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