Question

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 20 in tv set also has a width of 16 in. What is its height?

Answer 1

So, Pythagorean Theorem:
\[Height=\sqrt{20^{2}-16^{2}}=\sqrt{400-256}=\sqrt{144}=12\]