Select a proof from the list below to get started. To see and record your progress, log in here.

Title | Difficulty | Solved By | Date Added |
---|---|---|---|

Complementary Angles 1 | easy | 1408 (77%) | 2008-12-27 |

Complementary Angles 2 | easy | 1243 (68%) | 2008-12-27 |

Supplementary Angles 1 | easy | 1331 (73%) | 2008-12-27 |

Supplementary Angles 2 | medium | 1016 (56%) | 2008-12-27 |

Straight Angle 1 | easy | 1062 (58%) | 2008-12-24 |

Vertical Angles 1 | medium | 922 (50%) | 2008-12-27 |

Parallel Lines 1 | easy | 1165 (64%) | 2008-12-27 |

Parallel Lines 2 | easy | 1115 (61%) | 2008-12-27 |

Parallel Lines 3 | easy | 1104 (60%) | 2008-12-27 |

Parallel Lines 4 | hard | 664 (36%) | 2008-12-28 |

Converse of Parallel Lines 1 | easy | 1006 (55%) | 2008-12-28 |

Converse of Parallel Lines 2 | medium | 742 (41%) | 2008-12-28 |

Converse of Parallel Lines 3 | medium | 675 (37%) | 2008-12-28 |

Converse of Parallel Lines 4 | hard | 264 (14%) | 2008-12-28 |

Converse of Parallel Lines 5 | medium | 614 (34%) | 2008-12-28 |

Parallelogram 1 | easy | 670 (37%) | 2008-12-29 |

Parallelogram 2 | easy | 629 (34%) | 2008-12-29 |

Parallelogram 3 | medium | 533 (29%) | 2008-12-29 |

Parallelogram 4 | easy | 600 (33%) | 2008-12-29 |

Parallelogram 5 | hard | 345 (19%) | 2008-12-29 |

Parallelogram 6 | easy | 561 (31%) | 2008-12-29 |

Parallelogram 7 | medium | 486 (27%) | 2008-12-29 |

Parallelogram 8 | hard | 314 (17%) | 2008-12-29 |

Parallels and Perpendiculars 1 | medium | 420 (23%) | 2009-01-14 |

Parallels and Perpendiculars 2 | medium | 388 (21%) | 2009-01-18 |

Parallels and Perpendiculars 3 | medium | 379 (21%) | 2009-01-18 |

Triangle Sum Theorem 1 | easy | 551 (30%) | 2009-01-14 |

Triangle Sum Theorem 2 | medium | 430 (23%) | 2009-01-18 |

Triangle Sum Theorem 3 | hard | 283 (15%) | 2009-01-18 |

Triangle Exterior Angle Theorem 1 | easy | 487 (27%) | 2009-01-18 |

Quadrilateral Sum Theorem 1 | easy | 429 (23%) | 2009-01-18 |

Similar Triangles 1 | easy | 480 (26%) | 2009-02-08 |

Similar Triangles 2 | easy | 380 (21%) | 2009-02-08 |

Similar Triangles 3 | medium | 263 (14%) | 2009-02-08 |

Similar Triangles 4 | hard | 179 (10%) | 2009-02-08 |

Congruent Triangles 1 | easy | 604 (33%) | 2009-02-08 |

Congruent Triangles 2 | medium | 480 (26%) | 2009-02-08 |

Congruent Triangles 3 | hard | 338 (18%) | 2009-02-08 |

Congruent Triangles 4 | hard | 245 (13%) | 2009-02-08 |

Copyright ©2010. All rights reserved.