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Published bySusan Simpson Modified over 9 years ago
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Areas of Parallelograms, Triangles, & Rhombuses Keystone Geometry
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Area of a Parallelogram Parallelogram Area: The area of a parallelogram equals the product of a base & the height to that base. (A = bh) b h
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Area of a Triangle b h b h Triangle Area Theorem: The area of a triangle equals half the product of a base & the height to that base. (A = bh)
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Area of a Rhombus Rhombus Area Theorem: The area of a rhombus is equal to one half the product of its diagonals. Note! A Rhombus is also a parallelogram, so if you have the base and height you can use A(rhombus) = bh A B C D M
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Summary s b h A(square) = s 2 =bh A(rectangle) = bh b h A(||-gram) = bh b h A(rhombus) = bh b h b h A(triangle) =
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Examples #1-6. Find the area of the figure. First, start with a drawing. Label all of the parts. Find the formula you want to use. Are you missing anything? If so, how can you find it? Plug in your given information and solve!
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Examples #1-3 1.2.3.
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Examples #4-6 4. A rhombus with diagonals 4 and 6. 5. An equilateral triangle with sides of 8 feet. 6. An isosceles triangle with sides of 10, 10 and 16. 4.5.6.
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More Examples 5 5 4 4 8 10 5 5 6 8 13 15 5 7.8. 9.
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