Polygons can be regular or irregular in shape. A polygon is a closed 2D shape with at least three sides. A regular polygon is a polygon with all equal sides and angles. An irregular polygon is a ...

Because of supposed design difficulties with more complex shapes, do-it-yourselfers often stick to basic squares or rectangles when using landscaping timbers and railroad ties to make borders for ...

A technician often has to sketch or design ductwork and the other parts of an HVAC system. Sometimes you have to sketch the room or building you are working with. This means working with lines, angles ...