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प्रश्न
The diameter of a right circular cylinder is 12 m and the slant height is 10 m. Find its curved surface area and the total surface area .
उत्तर
Diameter of the cylinder = 12 m ⇒ radius = 6 m
Curved surface area = circumference of the base × height
= `2pir xx h`
= `2 xx 22/7 xx 6 xx 10`
= 377.14 m2
Curved Surface area = 377.14 m2
Total surface area = Curved surface area + (2 × base area)
= `2pirh + 2pir^2`
= `2pir(h + r)`
= `2 xx 22/7 xx 6 xx (10 + 6)`
= `2 xx 22/7 xx 6 xx 16`
= `603.42 "m"^2`
Total Surface area = 603.42 m2
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