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In a circle, if the radius is 10 cm, what is the circumference?

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Question: In a circle, if the radius is 10 cm, what is the circumference?

Options:

  1. 20π cm
  2. 10π cm
  3. 30π cm
  4. 40π cm

Correct Answer: 20π cm

Solution: 

The circumference of a circle is given by the formula C = 2πr. Thus, C = 2π(10) = 20π cm.

In a circle, if the radius is 10 cm, what is the circumference?

Practice Questions

Q1
In a circle, if the radius is 10 cm, what is the circumference?
  1. 20π cm
  2. 10π cm
  3. 30π cm
  4. 40π cm

Questions & Step-by-Step Solutions

In a circle, if the radius is 10 cm, what is the circumference?
  • Step 1: Understand that the circumference of a circle is the distance around it.
  • Step 2: Know the formula for circumference, which is C = 2πr, where r is the radius.
  • Step 3: Identify the radius given in the question, which is 10 cm.
  • Step 4: Substitute the radius into the formula: C = 2π(10).
  • Step 5: Calculate 2 times 10, which equals 20.
  • Step 6: So now we have C = 20π cm.
  • Circumference of a Circle – The circumference is the distance around a circle, calculated using the formula C = 2πr, where r is the radius.
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