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Instruments used in mathematics and geometry

compasses

noun

a piece of equipment used for drawing circles, consisting of two thin parts joined in the shape of the letter V

dividers

noun

a piece of equipment used for measuring or drawing lines and angles, consisting of two pieces of metal with pointed ends that are joined together at the top

plumb line

noun

a piece of string with a metal object attached to the bottom, used for checking whether a wall is straight or for measuring the depth of water

protractor

noun

an object that is shaped like half a circle and is used for measuring and drawing angles

ruler

noun

an object used for measuring or for drawing straight lines, consisting of a long flat piece of plastic, wood, or metal marked with units of measurement

set square

noun

a triangle for drawing lines and measuring angles

slide rule

noun

a simple piece of equipment like a ruler with a piece in the middle that slides along, used for calculating

theodolite

noun

a piece of equipment that a surveyor uses for measuring angles

triangle

noun

a small object with three sides and one angle that is 90°, used for drawing straight lines, triangles, and right angles

T-square

noun

a tool in the shape of the letter T that can help you to draw lines that are exactly parallel or in the shape of a square. A T-square is used in making detailed plans for buildings, etc.

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