Which statement regarding the interior and exterior angles of a triangle is true? |
a. An exterior angle is supplementary to the adjacent interior angle. |

(triangle (9x)° T:(5x)° The value of x is _____ |
3 |

Which is a true statement about the diagram? |
c. m<1 + m<2 = 180° |

x° S: 35° R: 58° What is the value of x? |
d. x = 93 |

Which represents an exterior angle of triangle ABF? |
d. <CAB |

(x + 15)° x° (4x – 20)° What is the value of x? |
d. x = 40 |

Given: Lines y and z are parallel, and ABC forms a triangle l. |
a. alternate interior angles are congruent |

130°, x°, 134° The value of x is |
96 |

J K M L |
b. m<KML + m<MLK = m<JKM |

X, Y, Z |
d. m<Y = 120° |

Which angle has a measure equal to the sum of m<SQR and the m<QRS? |
a. <RSC |

x° P: 38° O: 39° Which statement about the value of x is true? |
a. x > 38 |

Which statements are always true regarding the diagram? Check all that apply. |
m<5 + m<3 = m<1 m<5 + m<6 = 180° m<2 + m<3 = m<6 m<2 + m<3 + m<5 = 180° |

D A B E C F |
b. <CBE |

W X Y Z |
c. m<WXY + m<YXZ = 180° |

# Triangle Angle Theorems

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