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 <math>{\displaystyle r}</math> and the circumference <math>{\displaystyle c}</math> of a circle is <math>~c = 2\pi r.</math>

The area <math>{\displaystyle A}</math> of a circle of radius <math>{\displaystyle r}</math> is <math>{\displaystyle ~A = \pi r^2.}</math>

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