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Question

A milk carrying container has the shape of a cylinder mounted on a frustum. The radius of the cylinder is 14 cm and height is 20 cm. The other diameter of the frustum is 7 cm and its height is 5 cm. What is the curved surface area of the container?

A
1880 cm2(approx)
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B
201.12 cm2(approx)
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C
1060.5 cm2(approx)
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D
2399.65 cm2(approx)
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Solution

The correct option is D 2399.65 cm2(approx)
Curved surface area of the required container = Surface area of cylinder + Surface area of frustum.

Radius of the cylinder, R = 14 cm
Height of the cylinder, h = 20 cm
Curved surface area of cylinder = 2πRh
= 2×227×14×20
= 1760 cm2

Radii of the furstum are R and r, where R is 14 cm and r is 3,5 cm.
Slant height of frustum, l = (143.5)2+52 =11.63

Curved surface area of the frustum = πl(R+r)
= 227×17.5×11.63 = 639.65 cm2

Total curved surface area of the container
= 1760 cm2+639.65 cm2=2399.65 cm2

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