STANDARD G.CO.C.10
Prove theorems about triangles. *Theorems include: measures of interior
angles of a triangle sum to 180°; base angles of isosceles triangles are
congruent; the segment joining midpoints of two sides of a triangle is
parallel to the third side and half the length; the medians of a triangle
meet at a point.* |

WORKSHEETS |
Regents-Interior and Exterior Angles of
Triangles 1a
GEO/GE/A
*MC* |
1/11/5 |
TST
PDF
DOC
TNS |

Regents-Interior and Exterior Angles of
Triangles 1b
GEO/GE/A
*bimodal* |
TST
PDF
DOC |

Regents-Interior and Exterior Angles of
Triangles 2
GE/A |
4/2 |
TST
PDF
DOC
TNS |

Regents-Midsegments
GEO/GE/A |
1/16/1 |
TST
PDF
DOC
TNS |

Regents-Triangle Proofs
GEO/GE |
4/1 |
TST
PDF
DOC
TNS |

Practice-Interior and Exterior Angles of
Triangles 1 |
10 |
WS
PDF |

Practice-Interior and Exterior Angles of
Triangles 2 |
6 |
WS
PDF |

Journal-Interior and Exterior Angles of
Triangles |
5 |
WS
PDF |

Practice-Midsegments |
10 |
WS
PDF |

Journal-Midsegments |
2 |
WS
PDF |

VIDEOS |
Applying the Triangle Angle-Sum
Theorem |
VID |

Using the Triangle
Midsegment Theorem |
VID |

Using the Triangle
Midsegment Theorem to measure indirectly |