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trochoid
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The curve traced out by a fixed point on the radius or its extension of a circle as the circle rolls along a straight line. The curve is also given the name:
- curtate cycloid if the fixed point is inside the circumference;
- cycloid if the fixed point is on the circumference;
- prolate cycloid if the fixed point is outside the circumference.
However, there is no consistency about the usage of these terms.
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