Answer:
6mm
Step-by-step explanation:
B is x.
15 IS HYPOTENUS.
Therefore b is15-9
12
(^ standing for squared)
a^ + b^ = c^
9^ + b^ = 15^
81 + b^ = 225
now use algebra
b^ = 225 - 81
b^ = 144
b = the square root of 144
b = 12
