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Published byBernard Wilkinson Modified over 9 years ago

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**find the perimeter and area of triangles and trapezoids.**

Goal: I will be able to find the perimeter and area of triangles and trapezoids. Tool Bag Formulas, equations, Vocabulary, etc. Here’s How…Notes & Examples Standard MG 2.1 – Use formulas to find perimeter and area of basic two-dimensional figures Example #1 find the perimeter of the trapezoid: 14 8 8 10 Perimeter = P = = 40 Example #2 find the area of the following triangle: Area of a parallelogram = b • h Two Triangles make the parallelogram h Area of 1 Triangle = ½ area of parallelogram b Area of Triangle = ½ b • h

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**find the perimeter and area of the following triangle:**

You Try find the perimeter and area of the following triangle: 10 10 6 16 Example #3 find the area of the following trapezoid: b 2 b 1 h b 1 b 2 Area of a parallelogram = b • h Area of a parallelogram = ( ) • h b 1 2 Area of a trapezoid = ½ ( ) • h b 1 2 You Try find the area of the following trapezoid: 16 6 12

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**For any right triangle, the sides are related as follows:**

Pythagorean Theorem For any right triangle, the sides are related as follows: c a b Example #4 find the missing side of the following triangles: x 12 5 You Try find the missing side of the following triangles: a) b) x 4 3 10 8 x

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