Triangular pieces in an instruments box are called

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Protectors

Compasses

Scales

Set squares

answer is D.

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Detailed Solution

Concept- Triangular shape has three edges, also has three vertices. It is in the basics of geometry and the sum of the interior angles of the triangle is 180°, and the sum of the sides of the triangle is the length of the triangle.
Protectors are semi-circular pieces.
Compasses are two needles connected by a hinge joint piece.
Scales are rectangular pieces Given, triangular box of an instrumental box, and set square is triangle in shape, having three sides with three vertices, and one angle is 90° ,also the sum of interior angles of set square is 180°.set square is used to draw the straight lines and angles as well, there are many type of set squares in field adjustable, technical etc. Simplest form of a set square is in a triangular shape.
Hence, the correct option is 4) set squares.

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