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The radius of a semi-circle is the same as the radius of the circle that was cut in half.

The radius of a circle is the distance from the center of the circle to any point on the circle.

That's the same as 1/2 of the diameter.

It's easy to measure it on a semi-circle, because you don't even need to determine where

the center is. The diameter is just the length of the flat side, and the radius is half of that.

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14y ago

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