What is the area of a circular piston with a diameter of 4 inches?

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Multiple Choice

What is the area of a circular piston with a diameter of 4 inches?

Explanation:
Area of a circle is found with A = πr^2, so when you know the diameter you use radius = diameter/2. With a diameter of 4 inches, the radius is 2 inches. Plugging in gives A = π(2)^2 = 4π square inches, which is about 12.566 in^2. So the area is 12.566 in^2. The other numbers come from circles with different radii, not from a diameter of 4 inches.

Area of a circle is found with A = πr^2, so when you know the diameter you use radius = diameter/2. With a diameter of 4 inches, the radius is 2 inches. Plugging in gives A = π(2)^2 = 4π square inches, which is about 12.566 in^2. So the area is 12.566 in^2. The other numbers come from circles with different radii, not from a diameter of 4 inches.

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