Question 629224
What does it mean to refer to a 20 in tv set or a 25 in tv set?
It's the length of the diagonal.
--------------------------
 Such units refer to the diagonal of the screen.
Why did you ask?
--------------------
 A 20 in tv set also has a width of 16 inches. What is its height?
If it's the 4:3 format, width to height ratio, it's 12 inches.
d^2 = w^2 + h^2
----------------
What is the height of a 20 in tv?
See above.