Determine the Angle $\theta$ In the Design of the Streetlight Shown in the Following

Multiple Choice

Determine the angle $\theta$ in the design of the streetlight shown in the following figure.Round your answer upto decimal place. $$a = 6 , b = 7 \frac { 1 } { 2 } , c = 5$$

A) 80.5°
B) 95.5°
C) 75.5°
D) 85.5°
E) 90.5°