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 ...

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 ...

Ontario’s new Grade 9 math course is part of the province’s four-year mathematics strategy to ensure students have the skills they need for the future. Grade 9 math was last updated in 2005. There has ...