There are two types of triangle that you might be required to construct using a ruler and protractor. The first type is where you are given two sides and the included angle (SAS).

This KS2 maths article explores how an angle is a measure of a turn. Learn how to draw and measure angles using a protractor.

From there, surveyors eye the summit and measure the angle with the assistance of a glorified, highly accurate protractor — a telescopic device known as a theodolite.