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When the point is within the circle, the curve is called an ________

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When the point is within the circle, the curve is called an ________

(a) Inferior trochoid

(b) Superior trochoid

(c) Inscribed trochoid

(d) Superior trochiod

The question was posed to me in quiz.

My question is from Curves Used in Engineering Practice in chapter Lettering Practice, Scales & Curves of Civil Engineering Drawing

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Correct answer is (a) Inferior trochoid

To explain: Trochoid is a curve generated by a point fixed to a circle, within or outside its circumference, as the circle rolls along a straight line. The curve generated below shows us the inferior trochoid.

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