1. Area of Triangles and Parallelograms
Geometry
Area of Triangles and Parallelograms

2. Goals: Find the area of triangles & parallelograms.
Solve problems by combining areas.
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3. Area The measure of part of a plane surface. Measured in square units.
10 square inches can be written 10 in2.
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4. You should memorize
these formulas.
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5. Area of a Square s s
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6. Area of a rectangle W L
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7. Area of Parallelogram h b
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8. Area of Parallelogram L b W h
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9. Area of a Triangle h
Why does this work? b
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10. Area of a Triangle h b
Make a congruent triangle.
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11. Area of a Triangle
Rotate it 180. h b
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12. Area of a Triangle h b
Slide them together.
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13. Area of a Triangle h b This is just a parallelogram.
The triangle is 1/ 2 of this.
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14. Which triangle has the largest area?B C
They all have the same area: equal bases and equal heights.
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