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Quantitative - Mathematics - Solid Geometry:

Circles

MCQ - 76-11928

Question:

If a circle has an area of 81π, what is the circumference of the circle?

  1. 9π
  2. 81π
  3. 27π
  4. 81π
  5. 90π

Correct Answer: D

Explanation:

The formula for the area of a circle is πr2. For this particular circle, the area is 81π, so 81π = πr2. Divide both sides by π and we are left with r2=81. Take the square root of both sides to find r=9. The formula for the circumference of the circle is 2πr = 2π(9) = 18π. The correct answer is 18π.

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131 MCQ for effective preparation of the test of Circles of Solid Geometry section.

Read the MCQ statement: If a circle has an area of 81π, what is the circumference of the circle?, keenly and apply the method you have learn through the video lessons for Circles to give the answer. Record your answer and check its correct answer and video explanation for MCQ No. 76-11928.

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Solve the question for MCQ No. and decide which option (A through D/E) is the best choice to answer the MCQ, then click/tap the blue button to view the correct answer and it explanation.

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