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Consider a cycloid traced by a point $P$ on the circumference of a circle.
An arc of the cycloid is defined as being a part of the cycloid traced out by $P$ between the points where it meets the straight line.
Also known as
Some sources give this as an arch, while others call it a hump.
- Weisstein, Eric W. "Cycloid." From MathWorld--A Wolfram Web Resource. https://mathworld.wolfram.com/Cycloid.html