An easier way to define such geometric figure is to say that it is a closed curved line with all points equally distant from the center.
The following shows an example:
Real life examples bicycle wheels, coins, such as dimes and pennies, CDs, and MP3 players.
A line segment joining two points on the figure is a chord.The following are examples of two chords
When a chord passes through the center,we call it a diameter. A diameter usually divides such figure into two equal halves. Each half is called a semi-circle
Half a diameter is called a radius.
In other words, 2 radii= diameter
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