A right circular cone has a base radius r cm and a vertical angle 2y

^{o}. The height of the cone is-
**A.**

r tan y^{o}cm -
**B.**

r sin y^{o}cm -
**C.**

r cot y^{o}cm -
**D.**

r cos y^{o}cm -
**E.**

r cosec y^{o}cm

##### Correct Answer: Option C

##### Explanation

(frac{r}{h}) = tan y^{o}

h = (frac{r}{tan y^o})

= r cot y^{o}