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A circle has a diameter of 20 cm. What is its circumference? (2022)

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Question: A circle has a diameter of 20 cm. What is its circumference? (2022)

Options:

  1. 62.8 cm
  2. 40 cm
  3. 31.4 cm
  4. 20 cm

Correct Answer: 62.8 cm

Solution: 

Circumference = πd = π * 20 = 62.8 cm.

A circle has a diameter of 20 cm. What is its circumference? (2022)

Practice Questions

Q1
A circle has a diameter of 20 cm. What is its circumference? (2022)
  1. 62.8 cm
  2. 40 cm
  3. 31.4 cm
  4. 20 cm

Questions & Step-by-Step Solutions

A circle has a diameter of 20 cm. What is its circumference? (2022)
  • Step 1: Understand that the diameter of the circle is given as 20 cm.
  • Step 2: Recall the formula for the circumference of a circle, which is Circumference = π * diameter.
  • Step 3: Substitute the diameter into the formula: Circumference = π * 20 cm.
  • Step 4: Use the value of π (approximately 3.14) to calculate the circumference: Circumference = 3.14 * 20 cm.
  • Step 5: Multiply 3.14 by 20 to get the circumference: 3.14 * 20 = 62.8 cm.
  • Circumference of a Circle – The circumference of a circle can be calculated using the formula C = πd, where d is the diameter.
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