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What is the perimeter of a circle with a radius of 10 cm?

Practice Questions

Q1
What is the perimeter of a circle with a radius of 10 cm?
  1. 31.4 cm
  2. 62.8 cm
  3. 20 cm
  4. 15.7 cm

Questions & Step-by-Step Solutions

What is the perimeter of a circle with a radius of 10 cm?
  • Step 1: Understand that the perimeter of a circle is called the circumference.
  • Step 2: Know the formula for the circumference of a circle: Circumference = 2πr, where r is the radius.
  • Step 3: Identify the radius given in the question, which is 10 cm.
  • Step 4: Substitute the radius into the formula: Circumference = 2π(10).
  • Step 5: Calculate 2 times 10, which equals 20. So, Circumference = 20π.
  • Step 6: If needed, use the approximate value of π (about 3.14) to find a numerical answer: 20π ≈ 20 * 3.14 = 62.8 cm.
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