Question

A cylinder pipe whose diameter is 14 cm. and height is 20 cm. Find the cost to paint curved surface @ Rs. 2 per 100 cm^ 2.

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Answer 1

Diameter = 14 cm

Radius = 7 cm

Height = 20 cm

$curved \: surface \: area$

$2\pi rh$

$2 \times \frac{22}{7} \times 7 \times 20$

$2 \times 22\times 20$

$880 {cm}^{2}$

Cost of painting the curved surface

880 x 2

= Rs. 1760