| 21. | Any two of these cyclic quadrilaterals have one diagonal length in common.
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| 22. | For a quadrilateral the accessory parameters depend on one independent variable ?.
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| 23. | The following properties are valid in any Saccheri quadrilateral in hyperbolic geometry:
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| 24. | Thus " rectangle " is a kind of quadrilateral with special angles.
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| 25. | The doubled fundamental domain changes from a tetrahedron into a quadrilateral pyramid.
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| 26. | Sometimes it is referred to as the " quadrilateral of Michaelis ".
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| 27. | It is alongside NH 5 which forms part of the Golden Quadrilateral.
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| 28. | We have then got the probability that the quadrilateral is convex
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| 29. | Life becomes much simpler if you assume that the quadrilateral is bounded.
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| 30. | A theorem on cyclic quadrilaterals is helpful in detecting the indeterminate situation.
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