Area of Mixed Polygons

In 7th grade math, we're working on area.  We've gone through all of the basic formulas with careful attention to how they are related to one another -- the triangle being half of a rectangle, the trapezoid being a combination of two triangles, and so forth. Now we're on to area of mixed polygons, such … Continue reading Area of Mixed Polygons

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Units vs. Square Units (vs. Cubic Units)

When teaching basic geometry concepts, such as perimeter and area, you will save yourself quite a bit of grief if you start by making clear the difference between units and square units. Our common abbreviations for these, such as cm and cm², look deceivingly similar to each other and are easily confused by students who … Continue reading Units vs. Square Units (vs. Cubic Units)