# Formula for area

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The Primary Gal: Discovering the Formula for Area of a Triangle!

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Deriving a Formula for the Area of a Circle - never thought to use colored paper - it shows it better

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Surface Area and Volume Formulas for Geometric Shapes: Surface Area of An Elipse

Here are two different versions of a game where students roll dice to create rectangles and then find the area. In one version students count square units. In the second version they apply the formula for area.

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Formula Sheet for Area of 2d Shapes More

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THE BODY PERCENTAGE: the body is broken up into percentages of surface area taken up by each part for both ADULT FRONT/BACK and CHILD. Also, just notice how differently proportioned the child is comparing his/her percentages to the identical ones on the adult. This is mainly used for judging burns' severity when covering areas.

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This 4 page lesson includes a page that details the formulas for finding the area of a square, rectangle, triangle, parallelogram and trapezoid. The second and third pages are practice problems. Answer Keys included!

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Derive the formula for a parallelogram using only the formula for the area of a rectangle. It should make more sense for the student!

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