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Question

The curved surface area of frustum cone is 1,200 cm. The diameter of a cone is 50 and 12 cm. Find the slant height. (Use π = 3).


A
12.22 cm
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B
11.22 cm
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C
14.22 cm
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D
12.90 cm
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Solution

The correct option is D 12.90 cm

Curved surface area = π(R + r)s

Diameter = radius ×2

Radius, R = 25 cm, r = 6 cm

1,200 = 3×(25+6)×s

1,200 = 3×(31)×s

1,200/93 = s

Slant Height = 12.90 cm


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