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| Summary |
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 Parallelograms on the same base and between the same parallels are equal in area. |
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Parallelograms between the same parallels and having equal bases are equal in area. |
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Area of a parallelogram is equal to that of a rectangle of the same base and of same altitude. |
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Area of parallelogram = base x height |
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The area of a triangle is half that of a parallelogram with the same base and between the same parallels. |
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Hence area of the triangle  |
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Triangles on the same base and between the same parallels have equal areas. |
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Triangles with equal areas and on the same base have equal corresponding altitudes. |
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