Keep the construction lines when you draw them as they are evidence that you have constructed the triangle correctly.

There are two ways to construct a triangle using a ruler and a protractor. The first is a Side, Angle, Side (SAS) construction where two sides and the angle between them is known. The second is an ...

Besides measuring angles, the protractor may be used to open the rectangular pieces to a desired angle. Then, an angle or triangle may be drawn along the inside edges, which are marked with a ...