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 ...

It might be useful to look at M1 Properties of Angles and M1 Properties of 2D shapes. Constructions are accurate drawings of shapes using a ruler and protractor. From a sketch or a description ...

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.

Arthur Baragar, Constructions Using a Compass and Twice-Notched Straightedge, The American Mathematical Monthly, Vol. 109, No. 2 (Feb., 2002), pp. 151-164 ...

Many a mathematician has received a long letter from an unknown sender who claims to have found a way to trisect an angle using only a straightedge and compass. The mathematician may read passages ...