The size of a television screen is the diagonal measure of its rectangular screen. How large is a screen if it is 16 inches wide and 20 inches high?

Question

Quizplus · Accepted Answer

We can use the Pythagorean Theorem to find the diagonal measure of the screen:
(diagonal)^2 = (width)^2 + (height)^2
(diagonal)^2 = (16)^2 + (20)^2
(diagonal)^2 = 256 + 400
(diagonal)^2 = 656
diagonal = sqrt(656)
diagonal ≈ 25 inches
Therefore, the answer is D) 25 in.

The Size of a Television Screen Is the Diagonal Measure