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A rope of which a calf is tied is increased from 12 m to 23 m, how much additional grassy ground shall it graze?

Correct answer: C. 1210 m2

  • A. 1120 m2
  • B. 1250 m2
  • C. 1210 m2
  • D. 1200 m2

Explanation

The extra grazing area is the annulus formed when the radius increases from 12 m to 23 m: π[(23 m)² - (12 m)²] = 385π m² = 1210 m² using π = 22/7. The likely wrong choice is 1200 m², which is a rough approximation rather than the calculated annular area.

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