Sum

Find the curved surface area and the total surface area of a right circular cylinder whose height is 15 cm and the diameter of the cross-section is 14 cm.

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#### Solution

Diameter of the base of cylinder = 14 cm

Radius (r) = 14/2 cm = 7 cm

Height (h) = 15 cm

Curved surface area = 2πrh

= `2 xx 22/7 xx 7 xx 15` = 660 cm^{2}

Total surface area = 2πr (h + r)

= `2 xx 22/7 xx 7(15 + 7)`

= `2 xx 22/7 xx 7 xx 22` = 968 cm^{2}

Concept: Surface Area of a Cuboid

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