What is the area of a circle with radius 5?

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Multiple Choice

What is the area of a circle with radius 5?

Explanation:
Area of a circle is found with A = π r^2, so the area scales with the square of the radius. With a radius of 5, R^2 is 25, and A = π × 25 = 25π. So the area is 25π square units. The other numbers would come from different radii: for example, 50π would require a radius where r^2 = 50, about 7.07; 5π would come from r^2 = 5, about 2.24; and 10π from r^2 = 10, about 3.16. The correct idea is squaring the radius in the formula.

Area of a circle is found with A = π r^2, so the area scales with the square of the radius. With a radius of 5, R^2 is 25, and A = π × 25 = 25π. So the area is 25π square units. The other numbers would come from different radii: for example, 50π would require a radius where r^2 = 50, about 7.07; 5π would come from r^2 = 5, about 2.24; and 10π from r^2 = 10, about 3.16. The correct idea is squaring the radius in the formula.

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