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In a circle, if the radius is 7 cm, what is the circumference?

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Question: In a circle, if the radius is 7 cm, what is the circumference?

Options:

  1. 14π cm
  2. 21π cm
  3. 28π cm
  4. 49π cm

Correct Answer: 21π cm

Solution: 

The circumference of a circle is given by 2πr. Therefore, circumference = 2π * 7 cm = 14π cm.

In a circle, if the radius is 7 cm, what is the circumference?

Practice Questions

Q1
In a circle, if the radius is 7 cm, what is the circumference?
  1. 14π cm
  2. 21π cm
  3. 28π cm
  4. 49π cm

Questions & Step-by-Step Solutions

In a circle, if the radius is 7 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 7 cm.
  • Step 4: Substitute the radius into the formula: C = 2π * 7 cm.
  • Step 5: Calculate the multiplication: 2 * 7 = 14.
  • Step 6: Write the final answer as C = 14π 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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