Question

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

Answer 1

Answer:

Step-by-step explanation:

Answer 2

Answer:

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