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

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

Options:

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

Correct Answer: 14π cm

Solution: 

The circumference of a circle is given by the formula C = 2πr. Therefore, C = 2π(7) = 14π cm.

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

Practice Questions

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

Questions & Step-by-Step Solutions

If a circle has a radius of 7 cm, what is the length of the circumference?
  • Step 1: Understand that the circumference of a circle is the distance around it.
  • Step 2: Know the formula for the circumference, which is C = 2πr, where r is the radius.
  • Step 3: Identify the radius of the circle, which is given as 7 cm.
  • Step 4: Substitute the radius into the formula: C = 2π(7).
  • Step 5: Calculate 2 times 7, which equals 14.
  • Step 6: So, C = 14π cm. This means the length of 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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