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What is the area of a circle with a radius of 3 cm? (2021)

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Question: What is the area of a circle with a radius of 3 cm? (2021)

Options:

  1. 28.26 cm²
  2. 9.42 cm²
  3. 12.56 cm²
  4. 18.84 cm²

Correct Answer: 12.56 cm²

Solution: 

Area = πr² = π * 3² = 28.26 cm².

What is the area of a circle with a radius of 3 cm? (2021)

Practice Questions

Q1
What is the area of a circle with a radius of 3 cm? (2021)
  1. 28.26 cm²
  2. 9.42 cm²
  3. 12.56 cm²
  4. 18.84 cm²

Questions & Step-by-Step Solutions

What is the area of a circle with a radius of 3 cm? (2021)
  • Step 1: Identify the formula for the area of a circle, which is Area = πr².
  • Step 2: Substitute the radius (r) into the formula. Here, the radius is 3 cm.
  • Step 3: Calculate r². So, 3² = 9.
  • Step 4: Multiply π by 9. This gives you π * 9.
  • Step 5: Use the approximate value of π, which is about 3.14. So, calculate 3.14 * 9.
  • Step 6: The result of 3.14 * 9 is approximately 28.26 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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