Multiple choice

\text{What will be the total cost (in Rs.) of polishing the curved surface of a wooden cylinder at rate of Rs. 50 per } m^2 \text{, if its diameter is 70 cm and height is 6m? (Take } \pi =\frac{22}{7}\text{)}

  1. 660

  2. 612

  3. 675

  4. 624
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A Correct answer
Explanation

Curved surface area of cylinder = 2πrh. Given diameter = 70 cm, so radius = 35 cm = 0.35 m. Height = 6 m. CSA = 2 × (22/7) × 0.35 × 6 = 2 × 22 × 0.05 × 6 = 13.2 m². Cost at Rs. 50 per m² = 13.2 × 50 = Rs. 660.

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