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When a solid completely penetrates another solid, there will be two lines of intersection. These lines are called_____________

(a) line of interpenetration

(b) concyclic curves of lines

(c) hidden lines

(d) inside line

This question was posed to me in an international level competition.

My doubt stems from Intersection of Surfaces in division Development & Intersection of Surfaces of Engineering Drawing

1 Answer

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The correct option is (a) line of interpenetration

Best explanation: When a solid completely penetrates another solid, there will be two lines of intersection. These lines are called lines of interpenetration. The portion of the penetrating solid which lies hidden within the other solid is shown by dotted lines.

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