You'll have to use the Pythagorean theorem:
[tex] c^{2} = a^{2} + b^{2} [/tex]
In your case:
[tex] c^{2} = 20^{2} + 15^{2} [/tex]
[tex] c^{2} = 400 + 225
[/tex]
[tex] c^{2} = 625[/tex]
[tex]c = \sqrt{625}[/tex]
[tex]c = 25 inches[/tex]
Answer:
[tex]\boxed{\bf~The~answer~is~25~in.}[/tex]
Hope it helped,
Happy homework/ study/ exam!
