College Math CLEP Prep Practice Exam

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What is the area of a circle with a radius of 12 cm?

36 cm
324 cm
144 cm
648 cm

The correct answer is: 324 cm

A. 36 cm is incorrect because this is the area of a square with side length equal to the radius, not a circle. C. 144 cm is incorrect because this is the area of a circle with a radius of 24 cm, not 12 cm. To find the area of a circle, we use the formula A = πr², where r is the radius. D. 648 cm is incorrect because this is the area of a circle with a radius of 36 cm, not 12 cm. The correct answer is B because the formula for the area of a circle with a given radius is A = πr². Plugging in the given radius of 12 cm, we get A = π(12)² = 144π cm². Since we are looking for the numerical value of the area, we can use the approximate value