Questions

The approximate change in the total surface area of a right circular cone when the radius ‘r’ remains constant while altitude h changes by ‘ $α$ ’ is

Moderate

A

$\frac{πrhα}{\sqrt{r^{2} + h^{2}}}$

B

$\frac{πrh}{\sqrt{r^{2} - h^{2}}}$

C

$\frac{πrhα}{\sqrt{r^{2} - h^{2}}}$

D

$\frac{πhα}{\sqrt{r^{2} + h^{2}}}$

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