Plz Check my Geometry (Urgent)
posted by Ariel .
***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.
=

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. 
Thanks:)

Glad to be of help!

Find the area of a parallelogram with sides of 6 and 12 and an angle of 60°.
Respond to this Question
Similar Questions

random error messages
Sometimes when posting a new message, a software error will occur with an "unable to post" warning. Right now I am working on fixing this error message once and for all. In the meantime, if you get this message, hit refresh on your … 
Why can't I post
I don't know why, but i am getting a friend to post this up for me, but i cannot post a question, when i do, the successful window never comes up. it just goes back to the forum and doesnt add. can anyone help me why? 
EnglishURGENTHELP NEEDED!
Can ANYONE please help me by going to either the very bottom of this page or the top of the next and click on "EnglishURGENTHELP NEEDED!"? 
Homework
We, my roomates and I, keep getting replies saying stop posting under more than one name. We are not posting under more than one name we are all different. We all live together and only have this common computer at the moment, but … 
Math PLZ help gtg to bed i need right NOW!!
What is the answer to 10 5/12 divided by 1 3/5? 
2nd time posting bc i still need HELP! PHYSICS!!!!
The velocity of a diver just before hitting the water is 8.6 m/s, where the minus sign indicates that her motion is directly downward. What is her displacement during the last 0.86 s of the dive? 
math
I’ve skipped to much school, well not necessarily skipped but have been sick. I had strep throat for 2 weeks. Now i get this project mailed to me, sleep all day, and didn't do it. I just need one more strategy that explains this: … 
Physics
I had posted this question once before, but no one helped me on this one. So I am posting this question again. Suppose the flame of a gas burner stove emits light just like a blackbody. The flame appears blue emiting most of the light … 
LIVING ENVIRONMENT
the ability to grow in size is a characteristic of living organism .Although an icicle may grow in size over time,it is considered nonliving because there is 1)an incerase in matter ,but no increase in the number of icicle. 2)an interaction … 
Reed
Hey Reed u told me u will check my essay and u didn't check it so i posting in this post! PLZ remove the last post which was Yesterday cause I posted my essay there and after u check let me know. Plz don't remove this until I reply …