Question

Please help me! What is the length of EF in the right triangle below?

A.6
B.180
C.468
D.
$\sqrt{468}$
E.
$\sqrt{180}$
F.30

Answer 1

The answer is E, because of the pythagorean theorem

Answer 2

use the pythagorean theorem:
EF² +DF²=DE²
EF²=18²-12²=180
EF=√180
E is the answer.