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The main difference between a rectangle and a parallelogram that makes rectangle a special case of the parallelogram is the fact that all the angles of a rectangle are equal to 90 degrees. This is not the case in a parallelogram because the adjacent angles are only supplementary to each other.

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vincent412

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3y ago

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They are not all rectangles because a rectangle is a special case of a parallelogram where all angles = 90 degrees.

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Wiki User

13y ago
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Q: Why aren't all parallelograms rectangles?
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