Question

In the right triangle shown, DF=EF=3DF=EF=3D, F, equals, E, F, equals, 3.

Answer 1

Answer:

The side DE is 4.2 units long, approximately.

Step-by-step explanation:

In the given triangle, side DE is the hypothenuse. So, we can use Pythagorean's Theorem, where both legs are 3 units long.

$DE^{2}=DF^{2}+EF^{2}\\ DE^{2}=3^{2}+3^{2}\\DE^{2}=9+9\\DE=\sqrt{18} \approx 4.2$

Therefore, the side DE is 4.2 units long, approximately.