How to Find the Area If Given the Diameter
A circle's diameter is probably the closest thing it has to a soul. A straight measurement that connects every point on its circumference to its exact opposite by traveling through to the shape's center, the diameter controls the circle's circumference. Though the area of a circle is usually calculated with the radius, which is half the diameter, the area can also be found directly from the diameter's length with the equation area equals 1/4 * pi * diameter squared.
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Instructions
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Divide pi by 4. Pi divided by 4 equals approximately 0.7854.
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Square the measurement of the diameter. For this example, the diameter measures 9 inches. Squaring 9 inches results in 81 square inches.
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Multiply the diameter squared by a quarter of pi. Concluding this example, 81 square inches multiplied by 0.7854 equals 63.6173 square inches.
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