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# What is the formula for the area of a semicircle?

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The area of a semicircle is (?*R*R)/2. This means the radius of the semicircle is squared, multiplied by the constant pi, then divided by 2.

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A semicircle is half a circle. The diameter of the circle divides the circle into two equal semicircles. The formula for a semicircle is derived from the formula of the circle, only divided by two. An alternative method is to use the diameter, which is twice the length of the radius. Therefore, using the diameter of the circle, the formula for finding the area of one semicircle is (?*D*D)/4, where D is the diameter and is equal to 2R.

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## Related Questions

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The volume of a box with height "a" and basal area "B" is given by the formula V = a*B, and the volume of a spherical solid of radius "r" is given by the formula V = 4/3*pi*r^3. Volume measures the amount of space occupied by a solid figure.

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The formula for the volume of a cylinder is derived from the area of a circle. By finding the area of the base of the cylinder, you can multiply it by the height of the shape to find the volume.

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Calculating the area of polygons requires specific formula, while calculating perimeters simply involves the addition of all sides of a polygon. Calculating the perimeter or area of circles and other monogons involve formulas that use the mathematical concepts of pi and radius to reach a result.