Geometry Tools – The Ruler, The Compass, The Divider, The Set-Square & The Protractor

# Geometry Tools – The Ruler, The Compass, The Divider, The Set-Square & The Protractor

• Geometry Tools
• Ruler
• Compass
• Divider
• Set-Squares
• Protractor
• Summary
• What’s Next?

In the first segment of the chapter Practical Geometry, we will learn about geometric tools.

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## What are the Geometric Tools?

Geometric tools are instruments used to draw shapes like line, circle, square, rectangle, triangle and so on. These tools include a ruler, compass, divider, set-squares and protractor.

Let us now see how each tool is used in constructing the basic shapes of geometry.

## Ruler

A ruler is a geometrical instrument used to draw and measure straight lines. There are two main components of a ruler:

### Ruler

1. A straight edge, which is used to draw line segments or shapes made up of line segments.
2. Markings of measurement on its edges, which are used to measure and easily construct line segments of definite lengths.

Generally, a centimetre and millimetre scale is used in geometry. Although, a ruler also has markings for measuring length in inches.

## Compass

A compass comprises two parts – a pointer and a pencil holder to attach a pencil. It is used to construct circles and angles.

### Compass

Along with a ruler it can be used to draw line segments and triangles as well.

## Divider

A divider looks just like a compass but unlike the latter, it has 2 pointers instead of 1.

### Divider

On its own, a divider cannot be used to draw shapes, but it can definitely be used to compare the size of different shapes that consist of line segments. Paired with a ruler, a divider helps in drawing line segments to the highest accuracy.

## Set squares

Most basic geometric toolsets include 2 types of set squares:

1. A right-angled isosceles triangle having the angles 45°, 45° and 90°.
2. A right-angled scalene triangle with angles 30°, 60° and 90°.

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