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If a circle has a radius of 4 cm, what is its circumference?

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Question: If a circle has a radius of 4 cm, what is its circumference?

Options:

  1. 8π cm
  2. 16π cm
  3. 12π cm
  4. 4π cm

Correct Answer: 8π cm

Solution: 

Circumference of a circle = 2πr = 2π(4) = 8π cm.

If a circle has a radius of 4 cm, what is its circumference?

Practice Questions

Q1
If a circle has a radius of 4 cm, what is its circumference?
  1. 8π cm
  2. 16π cm
  3. 12π cm
  4. 4π cm

Questions & Step-by-Step Solutions

If a circle has a radius of 4 cm, what is its circumference?
  • Step 1: Understand that the circumference of a circle is the distance around it.
  • Step 2: Know the formula for circumference, which is Circumference = 2πr, where r is the radius.
  • Step 3: Identify the radius of the circle, which is given as 4 cm.
  • Step 4: Substitute the radius into the formula: Circumference = 2π(4).
  • Step 5: Calculate 2 times 4, which equals 8.
  • Step 6: So, the circumference is 8π cm.
  • Circumference of a Circle – The circumference of a circle is calculated using the formula C = 2πr, where r is the radius.
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