Hello!
The answer is: The TV size is 20 inches.
Why?
Since we are looking for the diagonal and we have the dimensions of a rectangle (length and base), we must use the Pythagorean Theorem to find the length of the diagonal.
The Pythagorean Theorem states that:
[tex]a^{2} =b^{2}+c^{2}[/tex]
[tex]a=diagonal\\b=lenght\\c=height[/tex]
[tex]diagonal=\sqrt{lenght^{2} + height^{2}}=\sqrt{17.1^{2} + 10.4^{2}}\\diagonal=\sqrt{292.41 + 106.16}=\sqrt{400.57}=20.01inches=20inches[/tex]
So, the TV size is 20 inches.
Have a nice day!
