set square ( synonym found)
Definition of set square:

°A flat triangular piece of plastic or other material, having corners of precise angles, used in technical drawing.
°a right angle tool used to determine if two surfaces join at a 90-degree angle, composed of two arms, usually made from metal.
Definition of set square:

°A flat triangular piece of plastic or other material, having corners of precise angles, used in technical drawing.
°a right angle tool used to determine if two surfaces join at a 90-degree angle, composed of two arms, usually made from metal.
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