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A solid cylinder has total surface area of 462 sq. cm. Its curved surface area is one third of the total surface area, Then the radius of the cylinder is
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Explanation:
Total surface area of cy;omder
⇒ 462 (given)
⇒(2πrh+2πr^2)=462cm2
r=radius, h=height
2πrh=462/3
πr^2=154cm^2
2πr^2=154×2=308
πr^2=154
r^2=154
r^2=154\22×7=49
r=7cm