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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:

Circle1

There is the center of a circle


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

Circle3

the chord

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.

Circle5

The radius

In other words, 2 radii= diameter


Einstein 1921 by F Schmutzer
Unfortunately, Albert Einstien is confused. If you don't want to get confused add more information to Math Geek Net by not making it a stub by expanding Circle.


NOTE!
Picture1
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