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Easy

Question

# The slant height of a cone is fixed as 7 cm. If the rate of increase in its height is 0.3 cm/sec. Then the rate of increase in volume when the height is 4cm

Hint:

**Volume of cone = **

## The correct answer is:

### Given : Slant height (l) = 7cm

Rate of increase in its height is 0.3 cm/sec.

Height = 4cm

Using Pythagoras Theorem

We know that,

Thus, the rate of increase in volume of cone is

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