answer:-to draw vetical and inclined lines
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Instrument Ruller, Rubber, set square, T Square, Drawing Table, Compass, etc.
A set square is a tool for marking angles in engineering and technical drawing, etc. They come in different angles and may be adjustable.
Set squares are useful for drawing parallel lines and perpendicular lines.
Used for drawing horizontal lines. To support set squares when drawing vertical line and inclined lines.
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.