x = length of half the base
If you draw out a triangle, the horizontal leg will be x, the vertical leg will be 147 and the angle of inclination (or angle of elevation) is 52 degrees
You'll use tangent to find x
tan(angle) = opposite/adjacent
tan(52) = 147/x
x*tan(52) = 147
x = 147/tan(52)
x = 114.84 ... this is approximate
Half the base is 114.84, so the full base is 2*114.84 = 229.68 which rounds to 230
The final answer is D.
