Use the Following to Answer Questions :
the Volume of a Cone

Use the following to answer questions :
The volume of a cone is given by the formula where r is the radius, h is the height of the cone, and $\theta$ is the indicated complement of the angle of deflection $\alpha$ . Note that when , the formula becomes that of a right circular cone (if , then h is called the slant height or lateral height of the cone) .
-What angle $\theta$ was used if the radius is 8 ft, the slant height is 2 ft, and the volume of the cone is 104 ft³?

A) 50.8849°
B) 0.8881°
C) 39.1151°
D) 89.1119°