Q7 of 107 Page 17

If the radii of the circular ends of a conical bucket 45 cm high are 5 cm and 15 cm respectively, find the surface area of the bucket.

Given: for the bucket,


Height = 45cm


r’ = 5cm


r’’ = 15cm


Curved surface area = π(r’ + r’’)l + π r’’2


= π(5 + 15)(26) + π (15)2


= 745 π cm2


Curved surface area of bucket = 745π cm2


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