On a piece of paper, use a protractor to construct right triangle def with de=4 in. , m∠d=90° , and m∠e=45° . what statement is true about the triangle?

The right triangle DEF has two equal sides which are DE and DF with length 4 inches. The side EF which is opposite to the angle m∠D=90° has the longest length with measurement equal to 5.66 inches. The longest side is also called as the hypotenuse.

Here, One of the angle in Right-triangle is 45, so other would also equal to 45 degrees, in that case, two sides would also be equal & Triangle is known as "Isosceles right triangle"

So, Draw the 90 degree angle, & two perpendicular line of 4 in. then, join their edges and your triangle will be ready

Hope this helps!

What’s the equation you are trying to solve to get x?

If you make it a little more clear i can answer it