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What must you be given to construct an equilateral triangle by compass?

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in Civil Engineering Drawing by (128k points)
What must you be given to construct an equilateral triangle by compass?

(a) One side

(b) One angle

(c) Two side

(d) One angle and one side

The question was asked during an interview for a job.

Question is from Geometrical Construction in section Lettering Practice, Scales & Curves of Civil Engineering Drawing

1 Answer

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The correct answer is (a) One side

Easiest explanation: An equilateral triangle is one which has all three sides of the same length. For the figure given below, with centres P and Q and radius equal to PQ, draw arcs intersecting each other at R. After this draw lines joining R with P and Q. The triangle obtained is the equilateral triangle.

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