Question

Mr Lee buys a 30-inch television. The height of the
screen is 18 inches. Given that television screens
are measured across the diagonal, i.e. the length of
the diagonal is 30 inches, how wide is the screen?​

Answer 1

Step-by-step explanation:

To find the area of screen,

lets find out area of triangle BCD by Pythagoras theorem

BC²=CD²+DB²

30²= CD²+18²

900=CD²+324

900-324=CD²

576=CD²

√576=CD

24 = CD

therefore the answer is 24 inches