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If a circle has a radius of 9 cm, what is the area of the circle?

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Question: If a circle has a radius of 9 cm, what is the area of the circle?

Options:

  1. 81π cm²
  2. 72π cm²
  3. 36π cm²
  4. 18π cm²

Correct Answer: 81π cm²

Solution: 

Area = πr² = π(9)² = 81π cm².

If a circle has a radius of 9 cm, what is the area of the circle?

Practice Questions

Q1
If a circle has a radius of 9 cm, what is the area of the circle?
  1. 81π cm²
  2. 72π cm²
  3. 36π cm²
  4. 18π cm²

Questions & Step-by-Step Solutions

If a circle has a radius of 9 cm, what is the area of the circle?
  • Step 1: Understand that the area of a circle is calculated using the formula Area = πr², where r is the radius.
  • Step 2: Identify the radius of the circle, which is given as 9 cm.
  • Step 3: Substitute the radius into the formula: Area = π(9)².
  • Step 4: Calculate (9)², which is 81.
  • Step 5: Now the formula looks like this: Area = 81π cm².
  • Step 6: The area of the circle is 81π cm².
  • Area of a Circle – The area of a circle is calculated using the formula A = πr², where r is the radius.
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