Question

http://www.intervisualtechnology.us/data/1/13919/unit_4_5_q3.png
12
65
10
50

Answer 1

Have you considered using the Law of Cosines? the Law of Sines?

Answer 2

the law Of sines

Answer 3

If I'm reading the figure correctly, we can do this problem without trig.

Two angles of the triangle are congruent.

If two angles of a triangle are congruent, then the sides opposite then are congruent.
(Converse of isosceles triangle theorem)

EG = 12

Therefore, EF = 12

@ellamoyseyuk