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

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

Options:

  1. 8π units
  2. 16π units
  3. 12π units
  4. 20π units

Correct Answer: 8π units

Solution: 

The circumference of a circle is given by the formula C = 2πr. Therefore, C = 2π * 4 = 8π units.

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

Practice Questions

Q1
If a circle has a radius of 4 units, what is its circumference?
  1. 8π units
  2. 16π units
  3. 12π units
  4. 20π units

Questions & Step-by-Step Solutions

If a circle has a radius of 4 units, 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 C = 2πr, where r is the radius.
  • Step 3: Identify the radius of the circle, which is given as 4 units.
  • Step 4: Substitute the radius into the formula: C = 2π * 4.
  • Step 5: Calculate the multiplication: 2 * 4 = 8.
  • Step 6: Write the final answer: C = 8π units.
  • 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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