Question

what does it mean to refer to a 20-inch tv set or a 25 inch tv set? such units refer to the diagonal of the screen. a 25 in tv set has a width of 20 inches. what is it's height?

Answer 1

Using pythagoras!

Answer 2

\[25^2 - 20^2 = ?^2\]\[?^2 = 225\]? = 15

so it's height is 15.