math
posted by victoria .
Find the length of the hypotenuse of a right triangle with legs of 9 cm and 12 cm.
a) 8 cm
b) 21 cm
c) 15 cm
d) 225 cm

Use the pythagorean theorem:
c^2 = a^2 + b^2
where
c = hypotenuse
a = one leg
b = the other leg
In the problem,
a = 9
b = 12
Now solve for c using the equation above. 
i need help but on one helps me with my math ugh

its C