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The approximate change in the total surf...

The approximate change in the total surface area of a right circular cone when the radius 'r' remains constant while altitude h changes by `'alpha'` is

A

`(pirhalpha)/(sqrt(r^(2)+h^(2)))`

B

`(pirh)/(sqrt(r^(2)-h^(2)))`

C

`(pirhalpha)/(sqrt(r^(2)-h^(2)))`

D

`(pihalpha)/(sqrt(r^(2)+h^(2)))`

Text Solution

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The correct Answer is:
A
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AAKASH SERIES-ERRORS AND APPROXIMATIONS-EXERCISE-I
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