Question 39
Mensuration of SolidsA right circular cone has a base radius r cm and a vertical angle 2y°. The height of the cone is
- A.r tan y° cm
- B.r sin y° cm
- C.r cot y° cm
- D.r cos y° cm
- E.r cosec y° cm.
Show the answer and explanation
Answer: C (r cot y° cm)
Explanation
Half the vertical angle is y, and tan y = r/h. So h = r/tan y = r cot y.