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प्रश्न
Find the total surface area of a closed cylindrical drum if its diameter is 50 cm and height is 45 cm. (π = 3.14)
उत्तर
Diameter = 50 cm
Radius = 25 cm
Height = 45 cm
Total surface area = 2 π r (h + r )
= `2 xx 3.14 xx 25 (25 + 45)`
= 10990 sq cm
Thus, the total surface area of the closed cylinderical drum is 10990 sq cm.
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