SOLUTION: find the area of a rectangle with length 4 and diagonal 5.

Question 204381: find the area of a rectangle with length 4 and diagonal 5.
Answer by Earlsdon(6294) (Show Source): You can put this solution on YOUR website!
Start with:

You are given the length (L = 4) but not the width (W).
You can find the width using the Pythagorean theorem: where c is the hypotenuse of the right triangle (also the diagonal of the rectangle), and a is the length of the rectangle.
b is the width (W) which is what we need to find before we can calculate the area. So...

The area is:
Substitute L = 4 and W = 3.

sq.units.
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