Today, we began by reviewing how to find the area of a trapezoid. There are two different formulae, and they are very similar. We took another look at the "Trapezoids to Parallelograms" animation, and then worked through the thinking to derive each of the area formulae. Students were instructed to use these answers as review material for the test they will be taking in class on Thursday.
We then looked at another way to determine the area of a parallelogram. This time, we used dot paper, and constructed a rectangle around the parallelogram. Then, using our knowledge of how to find the area of a triangle, we sliced off triangles from the rectangle to determine the area of the parallelogram.
Tonight's Homework: Complete the purple worksheet with the dot grids on it (questions, too). Then do page 729 ( 20 - 24 ). Don't forget to start studying for the test over areas of parallelograms and triangles.
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