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In a circle, if the radius is 5 cm, what is the circumference?

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Question: In a circle, if the radius is 5 cm, what is the circumference?

Options:

  1. 10π cm
  2. 15π cm
  3. 20π cm
  4. 25π cm

Correct Answer: 10π cm

Solution: 

Circumference = 2πr = 2π(5) = 10π cm.

In a circle, if the radius is 5 cm, what is the circumference?

Practice Questions

Q1
In a circle, if the radius is 5 cm, what is the circumference?
  1. 10π cm
  2. 15π cm
  3. 20π cm
  4. 25π cm

Questions & Step-by-Step Solutions

In a circle, if the radius is 5 cm, what is the 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 given in the question, which is 5 cm.
  • Step 4: Substitute the radius into the formula: Circumference = 2π(5).
  • Step 5: Calculate 2 times 5, which equals 10.
  • Step 6: Write the final answer as Circumference = 10π 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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