Constructions are accurate drawings of shapes using a ruler and protractor, a pair of compasses, a pencil and a ruler ...

A technician often has to sketch or design ductwork and other parts of an HVAC system. This means working with lines, angles, and other shapes. This article shows you how to draw and work with these ...

The second is an Angle, Side, Angle (ASA) construction where two angles and the side between them is known. To construct an SAS triangle: Draw the longest given side of the triangle using a ruler.