I need Geometry help with circles and tangents and intersecting lines. http://i79.photobucket.com/albums/j123/MistyBlue2010/05-24-2011031019PM.jpg

Question

owlfred · Answer

Hoot! You just asked your first question! Hang tight while I find people to answer it for you. You can thank people who give you good answers by clicking the 'Good Answer' button on the right!

anonymous · Answer

What do you need help understanding?

anonymous · Answer

For question 6 I don't understand how to find the perimeter

anonymous · Answer

Where do you need help on this topic?

anonymous · Answer

I am actually going to need help with all of the questions but maybe it will start to make more sense as we go

dumbcow · Answer

perimeter is sum of the sides
when 2 lines coming from point outside circle both are tangent to circle, then 2 lines are of equal length
ex:
2 lines coming from A are both length 2
2 lines coming from B both length 5
2 lines coming from C are both 3

anonymous · Answer

oooh I thought that whole side was 5

dumbcow · Answer

yeah they could have labeled it better

anonymous · Answer

Question 6, I believe the perimeter to be 20.
Here is how...
The measurements given are from the tangent to the vertex of the triangle
Two tangents from a point outside of the circle are equal.
Therefore AB = 7
AC = 5 and
BC = 8
Now just add

anonymous · Answer

Okay so for question 7 do I use

anonymous · Answer

a2+b2=c2?

dumbcow · Answer

gian better explanation than mine :)

anonymous · Answer

Use Pythagoras

anonymous · Answer

9 is 90 degrees right?

anonymous · Answer

OK here's how...
Call radius r
So root 28 squared minus root 5 squared is equal to r squared.
Therefore 28 - 25 = 3 = r squared.
taking square roots
r = root 3

anonymous · Answer

thanks :) that is what I got

anonymous · Answer

No problem

dumbcow · Answer

yes 9 is 90 degrees

anonymous · Answer

I am stuck on number 10 though...

anonymous · Answer

OH never mind I read the question wrong

anonymous · Answer

ED is half of CD

anonymous · Answer

For question 12 how would I find x? Do I assume that x is half of 9?

anonymous · Answer

Also for question 13 how would I find y?

anonymous · Answer

You do not have to assume, those line hatches on the chord tell you it is broken in two halves.