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If a circle has a circumference of 31.4 cm, what is the radius?

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Question: If a circle has a circumference of 31.4 cm, what is the radius?

Options:

  1. 5 cm
  2. 10 cm
  3. 15 cm
  4. 7.5 cm

Correct Answer: 10 cm

Solution: 

Circumference = 2πr, thus r = Circumference / (2π) = 31.4 / (2π) ≈ 5 cm.

If a circle has a circumference of 31.4 cm, what is the radius?

Practice Questions

Q1
If a circle has a circumference of 31.4 cm, what is the radius?
  1. 5 cm
  2. 10 cm
  3. 15 cm
  4. 7.5 cm

Questions & Step-by-Step Solutions

If a circle has a circumference of 31.4 cm, what is the radius?
  • Circumference of a Circle – The relationship between the circumference and radius of a circle is given by the formula C = 2πr.
  • Solving for Radius – To find the radius, rearranging the circumference formula is necessary.
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