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There is no formula for a semicircle.

There is a formula for the perimeter of a semicircle, a different formula for the area of a semicircle, and another one to generate a semicircle in the Cartesian plane.

You must specify which of these you want a formula for. Also, there may be additional information that is required to put the formula in the context of the available information. For example, the formula for the area will differ depending on whether you know the length of the straight side or the semi-circular arc.

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First off, "semi" means "half", which means that a semi-circle is only half a circle and not a full circle.

The formula for it is A=1/2 (Pi Symbol Here) r2

Hope this helps!

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Q: What is the formula for a semi-circle?
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