If you take a paper that is 20 inches long and fold it across a diagonal that is 25 inches long, what must the width be?
Use Pythagorean theorem
the diagonal is the hypotenuse one leg is 20 find the other leg (width)
h^2 = l1 2 + l2 2
252 = 202 + w2 Solve for w
...or think of a pythagorean triple