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A circle has a radius of 3 cm. What is the circumference?

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Question: A circle has a radius of 3 cm. What is the circumference?

Options:

  1. 6π cm
  2. 9.42 cm
  3. 12 cm
  4. 3π cm

Correct Answer: 6π cm

Solution: 

Circumference = 2πr = 2π(3) = 6π cm.

A circle has a radius of 3 cm. What is the circumference?

Practice Questions

Q1
A circle has a radius of 3 cm. What is the circumference?
  1. 6π cm
  2. 9.42 cm
  3. 12 cm
  4. 3π cm

Questions & Step-by-Step Solutions

A circle has a radius of 3 cm. What is the circumference?
  • Step 1: Understand that the circumference of a circle is calculated using the formula: Circumference = 2πr.
  • Step 2: Identify the radius of the circle. In this case, the radius (r) is 3 cm.
  • Step 3: Substitute the radius into the formula. So, we replace r with 3: Circumference = 2π(3).
  • Step 4: Calculate the multiplication: 2 × 3 = 6.
  • Step 5: Write the final answer using π: Circumference = 6π 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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