Answer:
B.) 9 in.
Explanation:
a^2 + b^2 = c^2
a^2 + 12^2 = 15^2
a^2 + 144 = 225
a^2 = 225 - 144
a^2 = 81
√a^2 = √81
a = 9
3.6m questions
4.5m answers