Answer:
15
Step-by-step explanation:
Pythagorean theorem states that the hypogenous of a right triangle is [tex]c=\sqrt{a^{2}+b^{2}}[/tex] . The hypogenous is the longest part of the triangle which is directly across from the 90 degree angle.
a = 9
b = 12
so,
[tex]c = \sqrt{9^{2}+12^{2} } = 15[/tex]
