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Calculus

Quick practice

Question 1 of 5

find the rate of change of the total surface area of right circular cone w.r.t.radius.(cone angle remain constant), when r = 5 cm.

A

10 \pi(1+\cos \theta) \mathrm{cm}^{2} / \mathrm{cm}

B

10 \pi(1+\operatorname{cosec} \theta) \mathrm{cm}^{2} / \mathrm{cm}

C

5 \pi(2+\operatorname{cosec} \theta) \mathrm{cm}^{2} / \mathrm{cm}

D

5 \pi(4+\operatorname{cosec} \theta) \mathrm{cm}^{2} / \mathrm{cm}

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