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 Everyday Examples
 Radius:  The distance from the center of a circle to any point on the circle. Also, the line segment that has the center of the circle as one endpoint and a point on the circle as the other endpoint.
A hi wheel is a bicycle with one large front wheel and one small rear wheel. The wheels provide examples of how circles are used in real-life. Each spoke inside the wheel represents a radius of the circle, because the spoke extends from the center of the wheel to the tire.

Hiwheel