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___________ is a curve generated by a point fixed to a circle, within or outside its circumference, as the circle rolls along a straight line.

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___________ is a curve generated by a point fixed to a circle, within or outside its circumference, as the circle rolls along a straight line.

(a) Cycloid

(b) Epicycloid

(c) Epitrochoid

(d) Trochoid

This question was posed to me in examination.

My question is taken from Construction of Cycloidal Curves in portion Geometrical Construction of Engineering Drawing

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The correct option is (d) Trochoid

Best explanation: Cycloid form if generating point is on the circumference of generating a circle. Epicycloid represents generating circle rolls on the directing circle. Epitrochoid is that the generating point is within or outside the generating circle but generating circle rolls on directing circle.

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