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Mathematics

Cylinder and Its Surface Area

A mansion has...

Question

A mansion has twelve cylindrical pillars each having the circumference 50 cm and height 3.5 m. Find the cost of painting the lateral surface of the pillars at Rs 25 per sq. m.

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Solution

Let r be the radius of each cylindrical pillar.

Circumference of each cylindrical pillar cm = 0.5 m

Height of each cylindrical pillar (h)

Lateral surface area of each cylindrical pillar

Cost of painting 1 m² = Rs 25

Cost of painting the lateral surfaces of 12 such pillars

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A mansion has twelve cylindrical pillars each having the circumference 50 cm and height 3.5 m. Find the cost of painting the lateral surface of the pillars at Rs 25 per sq. m.

Let r be the radius of each cylindrical pillar. Circumference of each cylindrical pillar cm = 0.5 m Height of each cylindrical pillar (h) Lateral surface area of each cylindrical pillar Cost of painting 1 m2 = Rs 25 Cost of painting the lateral surfaces of 12 such pillars

Let r be the radius of each cylindrical pillar.

Circumference of each cylindrical pillar cm = 0.5 m

Height of each cylindrical pillar (h)

Lateral surface area of each cylindrical pillar

Cost of painting 1 m² = Rs 25

Cost of painting the lateral surfaces of 12 such pillars