03. Parts of Circles

 


A circle is a shape with all points the same distance from the centre. It is a simple shape of geometry consisting of a line forming a closed loop, every point on which is a fixed distance from a centre point.

The diagram shows a circle which consists of its major parts.

 

The circumference of a circle is the distance around it. The term “circumference” is basically similar to the terms “perimeter”. However, "Circumference" is just a special term for the perimeter when applied to circles.

The diameter of a circle is the distance across a circle through the centre point. In geometry , a diameter of a circle is any straight line segment  that passes through the centre of the circle and whose endpoints are on the circumference.  The diameters are the longest chords of the circle. In other words, all diameters of a circle have the same length, this being twice the radius.

 

The radius of a circle   is any line segment  from its center to its perimeter. By extension, the radius of a circle is the 
 length of any such segment, which is half the diameter. The plural of radius can be defined as radii.

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01_Parts of Circles