Question 341240
The width, height and diagonal of a TV screen make a right triangle.
Thus, we cxan apply the Pythagorean Theorem.
{{{a^2 + b^2 = c^2}}}
Here the diagonal is the c, and the bottom can be the width and we'll call it a.
Solving, we get
{{{b^2 = c^2 - a^2}}}
{{{b^2 = 50^2 - 40^2}}}
{{{b^2 = 2500 - 1600}}}
{{{b^2 = 900}}}
and
b = 30