The only tools you need to make these shapes are a straight ruler and a compass or dividers (Figure 1). It is also useful to have a protractor (to measure angles) and a drafting square (to make square ...

With a protractor, the angles of any shape can found where two lines meet and form a corner. The shapes themselves can also be identified from this by matching the angles to the shape properties.

Angles are measured in degrees (°). They can measure between 0° and 360°. Different types of angles include acute, obtuse, reflex and right angle. You can measure angles using a protractor.