Question

The slant height of the frustum of a cone is 5 cm a
the perimeter of its plane ends are 20 cm and 12
find the curved surface of the frustum
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Answer 1

1. circumference of upper part of frustum =20cm. 2πr1 = 20 , r1= 10/π . 2. circumference of lower part of frustum = 12 cm. 2πr2 = 12, r2= 6/π . 3. height of frustum = 5 cm. 4. C.S.A of frustum = π(r1+r2)*l . 5. π(10/π+6/π)*5= 16*5=80cm. 6. hence, the C.S.A of the frustum is 80 cm . here ur answer hope it's help to u marks me brainlist plz, plz

Answer 2

Answer:

80 cm sq. units

no step explanation:

USE CSA OF FRUSTUM FORMULA