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

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Question: If a circle has a radius of 7 cm, what is its 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. Here, r = 7 cm, so circumference = 2π * 7 = 14π cm.

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

Practice Questions

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

Questions & Step-by-Step Solutions

If a circle has a radius of 7 cm, what is its circumference?
  • Step 1: Understand that the circumference of a circle can be calculated using the formula: Circumference = 2πr.
  • Step 2: Identify the radius (r) of the circle. In this case, the radius is 7 cm.
  • Step 3: Substitute the radius into the formula. So, we have Circumference = 2π * 7.
  • Step 4: Calculate the multiplication. 2 * 7 = 14.
  • Step 5: Combine the result with π. So, 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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