Solve problems involving the relationships of interior and exterior angles of a triangle.

### Clarifications

*Clarification 1:* Problems include using the Triangle Sum Theorem and representing angle measures as algebraic expressions.

**Subject Area: **Mathematics (B.E.S.T.)

**Grade:** 8

**Strand: **Geometric Reasoning

**Date Adopted or Revised: **08/20

**Status:** State Board Approved

**Related Courses**

**Course Number1111** |
**Course Title222** |

1205050: | M/J Accelerated Mathematics Grade 7 (Specifically in versions: 2014 - 2015, 2015 - 2020, 2020 - 2022, 2022 and beyond (current)) |

1205070: | M/J Grade 8 Pre-Algebra (Specifically in versions: 2014 - 2015, 2015 - 2022, 2022 and beyond (current)) |

1204000: | M/J Foundational Skills in Mathematics 6-8 (Specifically in versions: 2014 - 2015, 2015 - 2022, 2022 and beyond (current)) |

7812030: | Access M/J Grade 8 Pre-Algebra (Specifically in versions: 2014 - 2015, 2015 - 2018, 2018 - 2019, 2019 - 2022, 2022 and beyond (current)) |

**Related Access Points **

**Access Point Number** |
**Access Point Title** |

MA.8.GR.1.AP.5 | Given an image, solve simple problems involving the relationships of interior and exterior angles of a triangle. |

**Related Resources **

#### Formative Assessment

#### Lesson Plan

**Name** |
**Description** |

Triangles: Finding Interior Angle Measures | The lesson begins with a hands-on activity and then an experiment with a GeoGebra-based computer model to discover the Triangle Angle Sum Theorem. The students write and solve equations to find missing angle measures in a variety of examples. |

#### Tutorial

**Student Resources**

#### Tutorial