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If the radius of a circle is 7 cm, what is the circumference of the circle?

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Question: If the radius of a circle is 7 cm, what is the circumference of the circle?

Options:

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

Correct Answer: 21π cm

Solution: 

The circumference of a circle is calculated using the formula 2πr. Therefore, circumference = 2π × 7 cm = 14π cm.

If the radius of a circle is 7 cm, what is the circumference of the circle?

Practice Questions

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

Questions & Step-by-Step Solutions

If the radius of a circle is 7 cm, what is the circumference of the circle?
  • Step 1: Identify the radius of the circle. In this case, the radius is 7 cm.
  • Step 2: Recall the formula for the circumference of a circle, which is C = 2πr.
  • Step 3: Substitute the radius (7 cm) into the formula. So, C = 2π × 7 cm.
  • Step 4: Calculate the multiplication. 2 × 7 = 14.
  • Step 5: Combine the result with π. Therefore, the circumference is 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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