Description
A blackboard set square, often referred to as a 45-degree set square or triangle, is a geometric drawing tool used in mathematics, drafting, and engineering to create and measure angles of 45 degrees.
It's commonly made of transparent plastic or other durable materials. The set square is designed to assist in drawing accurate lines and angles on a blackboard or similar writing surface.
The "45-degree" designation indicates that one of the angles within the set square is a right angle (90 degrees), and the other two angles are each 45 degrees.
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