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segment in a circle or sphere (from its center to its perimeter or surface) and its length
The radius of a circle

In geometry, the radius of a circle or sphere is the shortest connection between the center and the boundary. It is half of the diameter.

r= d ÷ 2

d= 2 x r = d= r + r

r= Radius d= Diameter

The relationship between the radius and the circumference of a circle is

The area of a circle of radius is

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