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 | 942 (71%) | 2008-12-27 |

Complementary Angles 2 | easy | 959 (72%) | 2008-12-27 |

Supplementary Angles 1 | easy | 940 (70%) | 2008-12-27 |

Supplementary Angles 2 | medium | 803 (60%) | 2008-12-27 |

Straight Angle 1 | easy | 857 (64%) | 2008-12-24 |

Vertical Angles 1 | medium | 791 (59%) | 2008-12-27 |

Parallel Lines 1 | easy | 825 (62%) | 2008-12-27 |

Parallel Lines 2 | easy | 795 (60%) | 2008-12-27 |

Parallel Lines 3 | easy | 783 (59%) | 2008-12-27 |

Parallel Lines 4 | hard | 553 (41%) | 2008-12-28 |

Converse of Parallel Lines 1 | easy | 670 (50%) | 2008-12-28 |

Converse of Parallel Lines 2 | medium | 546 (41%) | 2008-12-28 |

Converse of Parallel Lines 3 | medium | 457 (34%) | 2008-12-28 |

Converse of Parallel Lines 4 | hard | 232 (17%) | 2008-12-28 |

Converse of Parallel Lines 5 | medium | 385 (29%) | 2008-12-28 |

Parallelogram 1 | easy | 473 (35%) | 2008-12-29 |

Parallelogram 2 | easy | 470 (35%) | 2008-12-29 |

Parallelogram 3 | medium | 377 (28%) | 2008-12-29 |

Parallelogram 4 | easy | 396 (30%) | 2008-12-29 |

Parallelogram 5 | hard | 213 (16%) | 2008-12-29 |

Parallelogram 6 | easy | 351 (26%) | 2008-12-29 |

Parallelogram 7 | medium | 285 (21%) | 2008-12-29 |

Parallelogram 8 | hard | 166 (12%) | 2008-12-29 |

Parallels and Perpendiculars 1 | medium | 321 (24%) | 2009-01-14 |

Parallels and Perpendiculars 2 | medium | 251 (19%) | 2009-01-18 |

Parallels and Perpendiculars 3 | medium | 248 (19%) | 2009-01-18 |

Triangle Sum Theorem 1 | easy | 479 (36%) | 2009-01-14 |

Triangle Sum Theorem 2 | medium | 373 (28%) | 2009-01-18 |

Triangle Sum Theorem 3 | hard | 237 (18%) | 2009-01-18 |

Triangle Exterior Angle Theorem 1 | easy | 380 (28%) | 2009-01-18 |

Quadrilateral Sum Theorem 1 | easy | 283 (21%) | 2009-01-18 |

Similar Triangles 1 | easy | 389 (29%) | 2009-02-08 |

Similar Triangles 2 | easy | 273 (20%) | 2009-02-08 |

Similar Triangles 3 | medium | 189 (14%) | 2009-02-08 |

Similar Triangles 4 | hard | 113 (08%) | 2009-02-08 |

Congruent Triangles 1 | easy | 431 (32%) | 2009-02-08 |

Congruent Triangles 2 | medium | 363 (27%) | 2009-02-08 |

Congruent Triangles 3 | hard | 289 (22%) | 2009-02-08 |

Congruent Triangles 4 | hard | 171 (13%) | 2009-02-08 |

Copyright ©2010. All rights reserved.