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If a circle has a radius of 4 units, what is its area?

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Question: If a circle has a radius of 4 units, what is its area?

Options:

  1. 16π
  2. 8π
  3. 12π
  4. 20π

Correct Answer: 16π

Solution: 

The area of a circle is given by the formula A = πr². Thus, A = π(4)² = 16π.

If a circle has a radius of 4 units, what is its area?

Practice Questions

Q1
If a circle has a radius of 4 units, what is its area?
  1. 16π
  2. 8π
  3. 12π
  4. 20π

Questions & Step-by-Step Solutions

If a circle has a radius of 4 units, what is its area?
  • Step 1: Understand that the area of a circle can be calculated using the formula A = πr².
  • Step 2: Identify the radius of the circle, which is given as 4 units.
  • Step 3: Substitute the radius (r) into the formula. So, we replace r with 4: A = π(4)².
  • Step 4: Calculate (4)², which is 16.
  • Step 5: Now, substitute back into the formula: A = π(16).
  • Step 6: The area of the circle is 16π square units.
  • 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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