Television sets. What does it mean to refer to a 20 in TV set or 25 in TV set? Such units refer to the diagonal of the screen. A 30 in TV set also has a width of 24 inches. What is its height?
What is the height of a 30 in TV? ___ inches

Question

Television sets. What does it mean to refer to a 20 in TV set or 25 in TV set?  Such units refer to the diagonal of the screen.  A 30 in TV set also has a width of 24 inches.  What is its height?
What is the height of a 30 in TV?  ___ inches

anonymous · Answer

use the pythagorean theorem, a^2+b^2=c^2
24^2+b^2=30^2
900-2^6(9)=b^2=900-64*9=900-576=324
b=$$\sqrt{324}$$ =18in