If the diagonal is the hypotenuse of a right triangle, you can use the Pythagorean theorem: a^2 + b^2 = c^2, where a and b are the lengths of the sides that make the right angle, and c is the length of the hypotenuse.
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to measure the wear and tear of the tire usage
Divide it across the diagonal - you don't need to measure anything.
Any rectangle that measures 12-in x 13-in has a diagonal ofsqrt(122 + 132) = 17.692 inches (rounded)
21 inches is the diagonal measure of the screen in a 21-inch TV.
You measure the screen by going diagonal across the screen. Some screens are up to one inch smaller than their advertised size.