Question

the silent height of a frustum of a cone is 15 cm and the Primemeters of its circular ends are 88 cm and 66 cm find the curved surface area of the frustum.

Answer 1

slant height = 15 cm

perimeter of circle = 2 pi r

2 p i r = 88

2 * 22/7 * r = 88

r = 88 * 7/44

r = 14 cm

applying the same

2 pi r = 66

2 * 22/7 * r = 66

r =  66* 7/44

r = 1.5 cm

curved surface area of frustum = pi ( r1 + r2 ) l

22/7 ( 1.5 + 14 ) 15

= 22/7 * 232.5 = 730.714

therefore the csa of the frustum = 730.714

Answer 2

See the attachment here

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