## The slant height of a frustum of cone is 4 cm and the circumference of its circular ends are 22cm and 10 cm. Find the curved surface area of

Question

The slant height of a frustum of cone is 4 cm and the circumference of its circular ends are 22cm and 10 cm. Find the curved surface area of the frustum .
4 points
64 sq cm
128 sq cm
880 sq cm

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3 weeks 2021-10-05T06:55:38+00:00 2 Answers 0 views 0

1. ## Given :

• Slant height of frustum = 4 cm
• Circumference of 1st end = 22 cm
• Circumference of 2nd end = 10 cm

## To Find :

• Curved surface area of frustum

## Solution :

### Case 2 :-

Now Curved surface area of frustum is

2. Curved surface area of frustum =

$$\sf\pi\times\dfrac{11+5}{\pi}\times 4$$

$$\sf\pi\times\dfrac{16}{\pi}\times 4$$

$$\sf\ 64cm^{2}$$