What does it mean to refer to a 20 inch TV or a 25 inch tv set? Such ubits are refer to the diagonal of the screen. A 25 inch TV set also has a width of 20 inch what is its height?

Question

would I multiply 20 by the height to get the diagonal? I think the answer is 15 inches

Please let me know if this is correct.

Answer 1

The "measurement" of a TV is based on the length of the diagonal, or the hypotenuse
So if a 25 inch TV has a width of 20, then
l^2 + 20^2 = 25^2
l^2 = 625-400 = 225
l = √225 = 15

Based on the Pythagorean Theorem.

Answer 2

So was I correcdt

Answer 3

... but how would you get 15 by multiplying 20 by the height?

Answer 4

Might you have noticed the new HD screen ratio comparison to its predecessor?

The old screen ratio was 4:3 while the new one is 16:9. That's 4^2/3^2.

The new screen ratio actually results in an 11% reduction in actual screen area.