Mensuration Practice Test 6

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Question : 22 of 40

Marks: +1, -0

Find the lateral surface area of the frustum of a cone whose slant height is 7 cm and circumference of its ends is 16 cm and 6 cm.

77 $cm^2$
85 $cm^2$
80 $cm^2$
62 $cm^2$

Solution:

R =

{16}/{2π}

=

8/π

r =

6/{2π}

=

3/π

Lateral surface area = π(R + r)l
=

π(8/π+3/π) 7

=

π× {11}/π × 7

=

77 cm^2

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