Instruments used in mathematics and geometry
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Parts of Geometry | Components Of Geometry with Examples
Compasses
A piece of equipment used for drawing circles, consisting of two thin parts joined in the shape of the letter V.
![](/mathshape/img/geo-compasses.png)
Dividers
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.
![](/mathshape/img/geo-divider.png)
Plumb line
A piece of string with a metal object fixed to the bottom, used for checking whether a wall is straight or for measuring the depth of water.
![](/mathshape/img/geo-plumbline.png)
Protractor
An object that is shaped like half a circle and is used for measuring and drawing angles.
![](/mathshape/img/geo-protractor.png)
Ruler
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.
![](/mathshape/img/geo-ruler.png)
Set Square
A flat plastic or metal tool with three straight sides and one right angle, used for drawing lines and measuring angles.
![](/mathshape/img/geo-set-square.png)
Slide Rule
A simple piece of equipment like a ruler with a piece in the middle that slides along, used for calculating.
![](/mathshape/img/geo-slide-rule.png)
Theodolite
A piece of equipment that a surveyor uses for measuring angles.
![](/mathshape/img/geo-theodolite.png)
Roll-n-Draw Ruler
A Multi-use tool ideal for drawing vertical lines, horizontal lines, parallel lines, angles and circles.
![](/mathshape/img/geo-roll.png)
T-square
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.
![](/mathshape/img/geo-tsquare.png)
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