The area of a plane figure, measured in square units(or units2), is the number of squares required to cover it completely.
Example:
The figure shown has an area of 9.5 square units: 8 whole squares plus 3 half-squares.

Here are some formulas for the areas of common plane figures.
Square |
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Rectangle |
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Triangle |
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Triangle |
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Parallelogram |
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Trapezoid |
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Circle |
A = πr2 |