| 21. | The parallelogram law implies that is additive in.
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| 22. | A fourth construction is using the parallelogram method.
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| 23. | Equality holds ( exclusively ) for a parallelogram.
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| 24. | Any line through the midpoint of a parallelogram bisects the area and the perimeter.
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| 25. | Is a lattice of parallelograms on the plane.
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| 26. | Given a norm, one can evaluate both sides of the parallelogram law above.
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| 27. | A crystal system is described by three prism with a parallelogram as its base.
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| 28. | To avoid this, Watt added the parallelogram linkage BCDE to form a pantograph.
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| 29. | Then A, B generate the fundamental parallelograms.
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| 30. | Given any parallelogram, construct on its sides four squares external to the parallelogram.
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