Thread: Geometry problem

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



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

Originally Posted by jenna14

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



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

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. there seems to be some useful theorem that i'm forgetting at the moment

Then

Originally Posted by red_dog

Then

that's the theorem i was forgetting. i thought it only worked for tangents though. that is, AE and AD had to be tangents, oh well

Thanks for the help!