The slant height of frustum of cone are 5 cm the perimeter of circular and 20 CM 12 cm find the curved surface area of frustum
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circumference of upper part of frustum =20cm.
2πr1 = 20 , r1= 10/π .
circumference of lower part of frustum = 12 cm.
2πr2 = 12, r2= 6/π .
height of frustum = 5 cm.
C.S.A of frustum = π(r1+r2)*l .
= π(10/π+6/π)*5= 16*5=80cm.
hence, the C.S.A of the frustum is 80 cm
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