30 60 set squares
45 set square
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90 degrees
A set square is a tool for marking angles in engineering and technical drawing, etc. They come in different angles and may be adjustable.
A try square is a metal ruler which is attached at right angles to another piece of metal, which looks like a triangle and is often used for drawing angles. A set square is a try square with an adjustable slide.
A set square? Only good for 30, 45, 60 amd 90 degree angles, though.
no, a square has 4 right angles