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 Everyday Examples
 Center of a Circle:  The point inside the circle that is the same distance from all of the points on the circle.

Image source: http://members.madasafish.com/~beardmore/Images/Reliant%20images/18%20rear%20end%20behind%20body.jpg

Circular objects that rotate often have an axis of rotation that pass through their center. For example, the axis of a car passes through the center of a tire in order to help the wheels turn so that the car can move.

Image source: http://williamlaird.com/CD%20%20PLAYER%20inside%20final.jpg

The motor of a compact disk player runs from its center to help the disk spin.

 

This carnival ride is in the shape of a circle. The red structure in the middle is the center of the circle. All points on the outside of the ride are the same distance from the center of the circle.

This carnival ride is circular with the center of the circle being the structure in the middle of the ride.