When you draw a shape, think about: How many sides it has. How long each side is. How many angles or corners it has. The type of angles it has - obtuse, acute or right angles. Use your ruler to ...

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 ...

Constructing a triangle without a protractor Place compass point at point P, and draw an arc using compass opened to 7 cm.