What will be the cost (in ₹) of polishing the curved surface of a wooden cylinder at rate of ₹50 per m², if its diameter is 70 cm and height is 6 m ?

(Take $\pi = \frac{22}{7}$)

660

We know that,

The curved surface area of a cylinder = 2π × (radius) × (height)

We have,

Diameter = 70 cm

Height = 6 m

The cost of polishing = Rs. 50 per m²

The radius of the wooden cylinder = \(\frac{70}{2}\) = 35 cm = 0.35 m

The total cost = 2 × \(\frac{22}{7}\) × 0.35 × 6 × 50 = 660