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The perimeter of a semi circle is 144 cm then the radius is_________?

Correct answer: B. 28 cm

  • A. 25 cm
  • B. 28 cm
  • C. 30 cm
  • D. 35 cm

Explanation

The perimeter of a semicircle includes its curved part and diameter, so P = πr + 2r. Thus 144 cm = (22/7 + 2)r, giving r = 144 cm ÷ (36/7) = 28 cm. The likely wrong choice is 30 cm, which comes from rough estimation or using an incorrect semicircle-perimeter formula.

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