Question

Television sets. What does it mean to refer to a​ 20-in TV set or a​ 25-in TV​ set? Such units refer to the diagonal of the screen. A 35​-in TV set also has a width of 28 inches. What is its​ height?

Answer 1

21 inch

Step-by-step explanation:

It means that the length of the diagonal of the TV is 20 inch or 25 inch.

Width of TV = 28 inch

diagonal of TV = 35 inch

Let L be the length of the TV

Use Pythagorean theorem

Diagonal^2 = length^2 + width^2

35^2 = L^2 + 28^2

L^2 = 1225 - 784

L^2 = 441

L = 21 inch