College Math Placement Practice Test

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What is the area of a circle with a radius of 3?

  1. 6π

  2. 9π

  3. 12π

  4. 15π

The correct answer is: 9π

To find the area of a circle, you can use the formula: \[ \text{Area} = \pi r^2 \] where \( r \) is the radius of the circle. In this case, the radius given is 3. Plugging this value into the formula: \[ \text{Area} = \pi (3)^2 \] Calculating further: \[ \text{Area} = \pi \times 9 = 9\pi \] Thus, the area of the circle is \( 9\pi \). This is why the correct answer is \( 9\pi \).

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