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 | 1011 (71%) | 2008-12-27 |

Complementary Angles 2 | easy | 1034 (73%) | 2008-12-27 |

Supplementary Angles 1 | easy | 1006 (71%) | 2008-12-27 |

Supplementary Angles 2 | medium | 860 (60%) | 2008-12-27 |

Straight Angle 1 | easy | 917 (64%) | 2008-12-24 |

Vertical Angles 1 | medium | 847 (60%) | 2008-12-27 |

Parallel Lines 1 | easy | 892 (63%) | 2008-12-27 |

Parallel Lines 2 | easy | 851 (60%) | 2008-12-27 |

Parallel Lines 3 | easy | 844 (59%) | 2008-12-27 |

Parallel Lines 4 | hard | 593 (42%) | 2008-12-28 |

Converse of Parallel Lines 1 | easy | 725 (51%) | 2008-12-28 |

Converse of Parallel Lines 2 | medium | 582 (41%) | 2008-12-28 |

Converse of Parallel Lines 3 | medium | 490 (34%) | 2008-12-28 |

Converse of Parallel Lines 4 | hard | 251 (18%) | 2008-12-28 |

Converse of Parallel Lines 5 | medium | 418 (29%) | 2008-12-28 |

Parallelogram 1 | easy | 515 (36%) | 2008-12-29 |

Parallelogram 2 | easy | 511 (36%) | 2008-12-29 |

Parallelogram 3 | medium | 414 (29%) | 2008-12-29 |

Parallelogram 4 | easy | 437 (31%) | 2008-12-29 |

Parallelogram 5 | hard | 234 (16%) | 2008-12-29 |

Parallelogram 6 | easy | 391 (27%) | 2008-12-29 |

Parallelogram 7 | medium | 320 (23%) | 2008-12-29 |

Parallelogram 8 | hard | 189 (13%) | 2008-12-29 |

Parallels and Perpendiculars 1 | medium | 360 (25%) | 2009-01-14 |

Parallels and Perpendiculars 2 | medium | 289 (20%) | 2009-01-18 |

Parallels and Perpendiculars 3 | medium | 286 (20%) | 2009-01-18 |

Triangle Sum Theorem 1 | easy | 525 (37%) | 2009-01-14 |

Triangle Sum Theorem 2 | medium | 409 (29%) | 2009-01-18 |

Triangle Sum Theorem 3 | hard | 263 (18%) | 2009-01-18 |

Triangle Exterior Angle Theorem 1 | easy | 425 (30%) | 2009-01-18 |

Quadrilateral Sum Theorem 1 | easy | 325 (23%) | 2009-01-18 |

Similar Triangles 1 | easy | 437 (31%) | 2009-02-08 |

Similar Triangles 2 | easy | 316 (22%) | 2009-02-08 |

Similar Triangles 3 | medium | 220 (15%) | 2009-02-08 |

Similar Triangles 4 | hard | 137 (10%) | 2009-02-08 |

Congruent Triangles 1 | easy | 475 (33%) | 2009-02-08 |

Congruent Triangles 2 | medium | 394 (28%) | 2009-02-08 |

Congruent Triangles 3 | hard | 313 (22%) | 2009-02-08 |

Congruent Triangles 4 | hard | 188 (13%) | 2009-02-08 |

Copyright ©2010. All rights reserved.