| 11. | The axiom was part of Pasch's approach to introducing the concept of order into plane geometry.
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| 12. | Forget plane geometry, I was plain scared.
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| 13. | The proof demonstrates the power of the algebra of complex numbers in handling problems in plane geometry.
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| 14. | The resulting structure, a model of elliptic geometry, satisfies the axioms of plane geometry except the parallel postulate.
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| 15. | In Euclidean plane geometry, the "'van Lamoen circle "'is a special circle associated with any given triangle T.
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| 16. | Unlike the square of plane geometry, the angles of such a square are larger than a right angle.
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| 17. | He is also honoured by having the Cartesian coordinate system used in plane geometry and algebra named after him.
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| 18. | In Euclidean plane geometry terms, being a parallelogram is affine since affine transformations always take one parallelogram to another one.
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| 19. | Cayley Klein plane geometry depends upon the selection of a conic that becomes the " absolute " of the space.
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| 20. | :: Since when do centimeters figure into plane geometry ? ?! carrots 23 : 49, 6 October 2009 ( UTC)
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