Today we started our new benchmark, MA.5.G.5.4- derive and apply formulas of area for parallelograms, trapezoids, and triangles from the area of a rectangle. Yesterday, we did a review on how to determine the area of a rectangle or square. The formula for area of a rectangle is a= b x h.
A= area, b= base, h=height
Today we used our knowledge of the area of a rectangle to determine the area of a triangle. Since we know a triangle is half of a rectangle, we can use the formula (b x h)/2 to find the area of a triangle. There are a couple of ways to write the area of triangle formula: a= 1/2b x h and (b x h)/2.
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| Area chart for rectangles and triangles. |
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| Formula chart for area. |
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| Jeffrey's journal entry for area of triangles. |
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| Determining area of a triangle. |
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