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What is the below instrument called?

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in Civil Engineering Drawing by (128k points)
What is the below instrument called?

(a) Set square

(b) Straightedge

(c) T-square

(d) Opisometer

I have been asked this question in examination.

This interesting question is from Geometrical Construction topic in portion Lettering Practice, Scales & Curves of Civil Engineering Drawing

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Right option is (c) T-square

The explanation: A T-shaped ruler used in engineering drawing, consisting of a short crosspiece, which slides along the edge of the drawing board, and a long horizontal piece: used for drawing horizontal lines and to support set squares when drawing vertical and inclined lines.

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