In circle C - I need to find AC, AB, FE and angle DAE.

http://img529.imageshack.us/img529/2...problemfx4.jpg

I'm not sure how to solve it because I got confused by the teacher. :rolleyes:

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- Sep 13th 2007, 04:56 AMjenna14Geometry problem
In circle C - I need to find AC, AB, FE and angle DAE.

http://img529.imageshack.us/img529/2...problemfx4.jpg

I'm not sure how to solve it because I got confused by the teacher. :rolleyes: - Sep 13th 2007, 08:06 AMJhevon
is C the center? (so the radius would be 10)?

if so, AC = AG + GC, where GC is the radius

we can find AB using Pythagoras' theorem

to find FE, you can draw a line from F to C and from E to C. note that you will form an isosceles triangle, with the angle at the center = 90 degrees. i think you can take it from there

to find angle DAE ... i have to think about some more:rolleyes:. there seems to be some useful theorem that i'm forgetting at the moment - Sep 13th 2007, 09:35 AMred_dog
$\displaystyle \displaystyle\widehat{DAE}=\frac{1}{2}(arc(DE)-arc(GF))$

$\displaystyle arc(GF)=180-60-90=30$

Then $\displaystyle \displaystyle\widehat{DAE}=\frac{1}{2}(60-30)=15$ - Sep 13th 2007, 09:46 AMJhevon
- Sep 13th 2007, 11:35 AMjenna14
Thanks for the help!