Answer :

Given: slant height of a bucket is 45


Radii of its top and bottom are 28 cm and 7 cm respectively.


Bucket is in the shape of a frustum.


Let A be the CSA of the Frustum


CSA of the frustum is given by: πl(r1 + r2) (here l is the slant height and r1 and r2 are the radii of top and bottom of the bucket(frustum))


A = πl(r1 + r2)


A = π × 45 × (28 + 7) = π × 45 × (35) = 4950 cm2


A = 4950 cm2


That is , curved surface area of the bucket is 4950 cm2

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