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 | 1014 (75%) | 2008-12-27 |

Complementary Angles 2 | easy | 968 (71%) | 2008-12-27 |

Supplementary Angles 1 | easy | 962 (71%) | 2008-12-27 |

Supplementary Angles 2 | medium | 785 (58%) | 2008-12-27 |

Straight Angle 1 | easy | 845 (62%) | 2008-12-24 |

Vertical Angles 1 | medium | 719 (53%) | 2008-12-27 |

Parallel Lines 1 | easy | 837 (61%) | 2008-12-27 |

Parallel Lines 2 | easy | 797 (59%) | 2008-12-27 |

Parallel Lines 3 | easy | 790 (58%) | 2008-12-27 |

Parallel Lines 4 | hard | 488 (36%) | 2008-12-28 |

Converse of Parallel Lines 1 | easy | 716 (53%) | 2008-12-28 |

Converse of Parallel Lines 2 | medium | 577 (42%) | 2008-12-28 |

Converse of Parallel Lines 3 | medium | 527 (39%) | 2008-12-28 |

Converse of Parallel Lines 4 | hard | 219 (16%) | 2008-12-28 |

Converse of Parallel Lines 5 | medium | 489 (36%) | 2008-12-28 |

Parallelogram 1 | easy | 638 (47%) | 2008-12-29 |

Parallelogram 2 | easy | 599 (44%) | 2008-12-29 |

Parallelogram 3 | medium | 510 (37%) | 2008-12-29 |

Parallelogram 4 | easy | 576 (42%) | 2008-12-29 |

Parallelogram 5 | hard | 336 (25%) | 2008-12-29 |

Parallelogram 6 | easy | 548 (40%) | 2008-12-29 |

Parallelogram 7 | medium | 472 (35%) | 2008-12-29 |

Parallelogram 8 | hard | 305 (22%) | 2008-12-29 |

Parallels and Perpendiculars 1 | medium | 396 (29%) | 2009-01-14 |

Parallels and Perpendiculars 2 | medium | 371 (27%) | 2009-01-18 |

Parallels and Perpendiculars 3 | medium | 362 (27%) | 2009-01-18 |

Triangle Sum Theorem 1 | easy | 509 (37%) | 2009-01-14 |

Triangle Sum Theorem 2 | medium | 398 (29%) | 2009-01-18 |

Triangle Sum Theorem 3 | hard | 251 (18%) | 2009-01-18 |

Triangle Exterior Angle Theorem 1 | easy | 462 (34%) | 2009-01-18 |

Quadrilateral Sum Theorem 1 | easy | 415 (30%) | 2009-01-18 |

Similar Triangles 1 | easy | 457 (34%) | 2009-02-08 |

Similar Triangles 2 | easy | 365 (27%) | 2009-02-08 |

Similar Triangles 3 | medium | 248 (18%) | 2009-02-08 |

Similar Triangles 4 | hard | 167 (12%) | 2009-02-08 |

Congruent Triangles 1 | easy | 538 (40%) | 2009-02-08 |

Congruent Triangles 2 | medium | 421 (31%) | 2009-02-08 |

Congruent Triangles 3 | hard | 288 (21%) | 2009-02-08 |

Congruent Triangles 4 | hard | 202 (15%) | 2009-02-08 |

Copyright ©2010. All rights reserved.