Question

If GB = GE and AC = 12 cm, find the length of DF.
answers :
15 cm
6 cm
12 cm
18 cm

Answer 1

http://tinypic.com/r/2mfg2th/5

Answer 2

i think its 6 ?

Answer 3

I think it's 12

Answer 4

is it because theyre the same lines?

Answer 5

nope, when I apply Pythagorean theorem, I have the same answer for them
let radius of the circle is r, let GB = GE =a
right triangle GBA has AB^2 = r^2 -a^2
and right triangle GEF has ED^2 = r^2 -a^2, too
therefore, AB = EF
and B and E are middle points of AC and DF respectively
therefore AC=DF =12

Answer 6

ohh so you have to use the pythagorean theorem? okay okay thanks(:

Answer 7

yw