Radius
line segment frau its mid pynt til its perimeter
In geometry, a radius o a raing or speere is a line segment frau its mid pynt til its perimeter. A radius is hal the lenth o the diameter in the same raing or speere. The radius o a regular polygon is the distance frau the pynt to a vertex.
![](http://upload.wikimedia.org/wikipedia/commons/thumb/0/03/Circle-withsegments.svg/200px-Circle-withsegments.svg.png)
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