WILL MARK BRAINLIEST

Length DE= 2√2

Length EF= 2√2

Step-by-step explanation:

The 45-45-90 rule is very special but this question is really simple. You have all the angles and one side.

STEPS:

1) Take 45 from angle D and use its sine to find side EF

2) sin45= x/4 => 2.82 or  2√2

3) Take either cos45 from angle D or use Pythagoras since we now have enough side lengths to use Pythagoras (faster for me to use cosine).

4) cos45=x/4 => 2.82 or  2√2

Further explanation:

If you don't understand the sine and cosines, here's a word play to help.

S O/H

C A/H

T O/A

S=Sine

C=Cosine

T= Tangent

O= Opposite

H= Hypotenuse

A= Adjacent

If you search a video on this word play it will help more since it is visual.

Good luck.

good bye

step-by-step explanation:

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