the answer is 52°
use the laws of trig
its a right triangle, so cotan 9/7 is 52°
tan(angle) = opposite/adjacent
tan(B) = AC/AB
tan(B) = 9/7
B = arctan(9/7)
B = 52.125 which is approximate
B = 52
--------------------------------------
The final answer is choice D) 52 degrees
