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The curve generated by a point fixed to a circle outside its circumference s it rolls along a circle outside it, is called _______________

(a) Inferior epitrochoid

(b) Superior trochoid

(c) Inferior trochoid

(d) Superior Epitrochoid

The question was asked during a job interview.

I would like to ask this question from Curves Used in Engineering Practice in division Lettering Practice, Scales & Curves of Civil Engineering Drawing

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Correct answer is (d) Superior Epitrochoid

The best I can explain: An epitrochoid is a roulette traced by a point attached to a circle of radius r rolling around the outside of a fixed circle of radius R, where the point is at a distance d from the center of the exterior circle.

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