Question

a wooden article was made by scooping out a hemisphere from each end of a solid cylinder as shown in figure if the height of the cylinder is 10 cm and its base is 1 of radius 3.5 cm find the total surface area of the article

Answer 1

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Answer 2

Given
Height of the cylinder = 10 cm
Radius of the base of the cylinder = 3·5 cm
Total surface area of article
= C.S.A. of cylinder + 2 × Area of hemisphere
= 2πrh + 2 × 2π ²
= 2π(h + 2r)
= 2 × 22/7 × 3·5 (10 + 2 × 3·5)
= 2 × 22 × 0·5 (10 + 7)
= 44 × 0·5 × 17
= 748 × 0·5
Total surface area of article
= 374 cm²