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Loop of the thread method is the practical application of ______ method.

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Loop of the thread method is the practical application of ______ method.

(a) Oblong method

(b) Trammel method

(c) Arcs of circles method

(d) Concentric method

This question was posed to me in homework.

Question is from Construction of Ellipse in chapter Geometrical Construction of Engineering Drawing

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The correct answer is (c) Arcs of circles method

Best explanation: Loop of the thread method is the practical application of the arcs of circles method. The lengths of the ends of the minor axis are half of the length of the major axis. In this method, a pin is inserted at the foci point and the thread is tied to a pencil which is used to draw the curve.

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