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The development of the curved surface of a cone is a __________ of a __________

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The development of the curved surface of a cone is a __________ of a __________

(a) sector, circle

(b) segment, circle

(c) segment, ellipse

(d) arc, parabola

I have been asked this question in examination.

I'm obligated to ask this question of Development of Surfaces topic in chapter Development & Intersection of Surfaces of Engineering Drawing

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Right answer is (a) sector, circle

The explanation: The development of the curved surface of a cone is a sector of a circle, the radius and the length of the arc of which are respectively equal to the slant height and the circumference of the base-circle of the cone.

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