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5 Cards in this Set
- Front
- Back
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Ptolemy |
(2nd century Egypt) assumed Playfair's Axiom |
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Saccheri |
(1667-1733) Italy
Tried to use proof by contradiction with a saccheri quadrilateral (unsuccessful) |
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Lambert |
(1728-1777) Switzerland
tried to us proof with a lambert quadrilateral (unsuccessful)
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Legendre |
(1752-1833) tried to prove the angle sum of a triangle is equal to 180. proved it is less than 180 |
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Omar Khayyam |
(11th century) Persia (islamic)
Used saccheri quadrilateral (before it was named); assumed lines that converge eventually intersect.
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