Problema Solution
A 21-inch-square TV is on sale at the local electronics store. If 21 inches is the measure of the diagonal of the screen, use the Pythagorean theorem to find the length of the side of the screen.
Answer provided by our tutors
let 'x' be the length of the side of the screen.
we have a right triangle with legs equal to x and hypotenuse equal to the diagonal of the screen that is 21 in
using Pythagorean theorem we can write
x^2 + x^2 = 21^2
x = ((21^2)/2)^0.5
x = 14.849 in
the length of the side of the screen is 14.849 in.