Geometric Tools and Their Uses Pair of compasses It can be used to draw circles and trace arcs. The distance between the pointer and the pencil is adjustable and can be changed to line up with measurements on a ruler, allowing us to create circles with specific dimensions. Set square A set square is a piece of equipment that can be used to draw lines and shapes. It's a great way to see whether a shape has a right angle, as a set square always has a corner with 90 degrees. Protractor The protractor is a semicircular disk that is used to measure the angles of shapes. It is graduated from zero to 180 degrees and therefore has the ability to measure the angle of any two intersecting lines or vertices within this range. Pair of dividers It looks similar to the compasses with its ' V '-shaped structure. However, it has pointers on both ends of the ' V '. The distance between them is adjustable and it is used to measure and compare lengths.