Question

1. The curved surface area of a cone is 4070 cm2 and its diameter if 70 cm. Find its slant height .

Answer 1

Answer:

Curved surface area of cone=

$\pi rl$

where r is the radius of the cone and the L is the slant height.

$Radius = \frac{Diameter}{2} = 35$

Hence ,curved surface area of this cone =

$\frac{22}{7} \times 35 \times l = 4070$

$=》l = \frac{7 \times 4070}{22 \times 35}$

$=》l = 37 \: cm$

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