A set square or triangle (American English) is an object used in engineering and technical drawing, with the aim of providing a straightedge at a right angle or other particular planar angle to a baseline. == Types == The simplest form of set square is a triangular piece of transparent plastic (or formerly of polished wood) with the centre removed.
A set square or triangle (American English) is an object used in engineering and technical drawing, with the aim of providing a straightedge at a right angle or other particular planar angle to a baseline. == Types == The simplest form of set square is a triangular piece of transparent plastic (or formerly of polished wood) with the centre removed.
Source: Wikipedia "Set square" · CC BY-SA 4.0
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