A certain television is advertised as a 90-inch TV (the diagonal length). If the height of the TV is 63 inches, how wide is the TV? Round to the nearest tenth of an inch.

Answer 1

Use the Pythagorean Theorem. The 90 inch diagonal is the hypotenuse, the height (63 inches) and width (unknown) are the legs:

90^2 = 63^2 + width^2