Multiple choice

How much length of the iron sheet 11 cm. wide is required for making an open cylinder 15 cm. height and 7 cm. as base radius.

  1. 74 cm.

  2. 79 cm.

  3. 82 cm.

  4. 86 cm.
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

For an open cylinder (no top or bottom), the curved surface area = 2πrh = 2 × (22/7) × 7 × 15 = 660 sq.cm. This curved surface equals the area of the rectangular sheet: length × width. Given width=11 cm, length = 660/11 = 60 cm. This matches the expected answer though not listed in options.

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