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If you double the diameter of a circle, the area will quadruple (be 4x greater).

The area of the circle increases exponentially with the diameter, or more precisely with the radius, which is 1/2 the diameter. A = (pi)r2

Doubling the diameter of a circle will quadruple the area (22 =4).

This is easily seen in pizzas, where the dough needed for a 16-inch Pizza can be used instead to make 4 pizzas with a diameter of 8 inches.

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The equation to find the area of a circle is a=(pi)r2. If the diameter is doubled, then the radius is also doubled, because the radius is just half the diameter.

The area of a circle once its radius (and therefore diameter) has been doubled can be expressed as follows: a'=(pi)(2r)2, which simplifies to a'=(pi)(4r2).

To find the proportion of a' and a, we just divide the second by the first. This gets us

[(pi)(4r2)]/[(pi)(r2)]=4

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Q: What happens to the area of a circle if the diameter is doubled?
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