# Definition:Cycloid/Generating Circle

< Definition:Cycloid(Redirected from Definition:Generating Circle of Cycloid)

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## Definition

Consider a cycloid formed from the locus of a point $P$ on the circumference of a circle rolling without slipping along a straight line.

The circle which rolls along the straight line is called the **generating circle** of the cycloid.

## Also known as

A **generating circle** can also be referred to as just the **generator**.

## Sources

- 1972: George F. Simmons:
*Differential Equations*... (previous) ... (next): $\S 1.6$: The Brachistochrone. Fermat and the Bernoullis