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If the diameter of a circle is 20 cm, what is the radius?

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Question: If the diameter of a circle is 20 cm, what is the radius?

Options:

  1. 5 cm
  2. 10 cm
  3. 15 cm
  4. 20 cm

Correct Answer: 10 cm

Solution: 

Radius = diameter/2 = 20/2 = 10 cm.

If the diameter of a circle is 20 cm, what is the radius?

Practice Questions

Q1
If the diameter of a circle is 20 cm, what is the radius?
  1. 5 cm
  2. 10 cm
  3. 15 cm
  4. 20 cm

Questions & Step-by-Step Solutions

If the diameter of a circle is 20 cm, what is the radius?
  • Step 1: Understand that the diameter of a circle is the distance across the circle through its center.
  • Step 2: Know that the radius is half of the diameter.
  • Step 3: Take the given diameter, which is 20 cm.
  • Step 4: Divide the diameter by 2 to find the radius: 20 cm / 2.
  • Step 5: Calculate the result: 20 cm / 2 = 10 cm.
  • Step 6: Conclude that the radius of the circle is 10 cm.
  • Circle Geometry – Understanding the relationship between the diameter and radius of a circle.
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