because its 360 degees
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In degrees? If so then a full circle is 360 degrees, so a half circle is 180 degrees.
Semi means half. So there are two semicircles in a circle.
The radius of a circle is half the diameter so if the radius of a circle is r, then the diameter is 2r.
If a circle has a circumference of 18pi, the radius is 9.
A sphere is three dimensional, a circle is not. So a tennis ball is sphere not a circle You can draw a circle on paper but is is not a sphere.