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Area and Perimeter By Christine Berg Edited by V T Hamilton

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Perimeter The sum of the lengths of all sides of the figure

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Area The number of square units inside a figure

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Calculating Area

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Area Abbreviations: A = Area b = base h = height

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Rectangle To find the area multiply the length of the base times the height

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Rectangle A = bh

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Parallelogram Draw a rectangle on graph paper. Cut off a triangle on one side and add it to the other. 1 23

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Parallelogram The rectangle becomes a parallelogram so the formula is the same as for a rectangle

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Triangle The area of a triangle is one half of the length of the base times the height

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Triangle 4in Area of the square is 4 times 4 or 16 sq. in. Area of the triangle is one-half 16, or 8 sq.in. A = 1/2 bh A = 1/2 (4)(4) A = 8 sq. in.

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