Multiple choice

What will be the cost of polishing curved surface of wooden cylinder at rate of Rs.20 per m2, if its diameter is 40 cm and height is 7m?

  1. Rs.176

  2. Rs.184

  3. Rs.175

  4. Rs.186
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The curved surface area of a cylinder is 2πrh. Here radius = 20 cm = 0.2 m, height = 7 m. CSA = 2 × π × 0.2 × 7 = 2.8π m². At Rs. 20 per m², cost = 2.8π × 20 = 56π ≈ Rs. 176.

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