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 $\pi = \frac{22}{7}$)
Answer & explanation
Correct answer: option 3
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