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Published byDeborah Morton Modified over 9 years ago

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Warm-Up Find the area and perimeter of the rectangle. 25 13

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**Formulas for Triangles and Quadrilaterals**

Geometry 9-1 Formulas for Triangles and Quadrilaterals

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Main Theme

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Parallelograms Important: the height, h, must be perpendicular to the base ***Not on the formula chart

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Example Find the area of a parallelogram with b = 9 in. and h = 5 in.

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Example A parallelogram has an area of 44 in2. If the height of the parallelogram is 5.5 in., what is the length of the base?

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**Triangles and Trapezoids**

Important: the height, h, must be perpendicular to the base

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Example Find the area of a trapezoid in which b1 = 8 in., b2 = 5 in., and h = 6.2 in.

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Example Find b2 of the trapezoid, in which A = 231 mm2.

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Example Find the area of the triangle.

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Rhombus and Kite ***Not on the formula chart

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Example Find d2 of a kite in which d1 = 14 in. and A = 238 in2.

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Example Find the area of the rhombus.

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