# Use the angle sum results for triangles and quadrilaterals to determine unknown angles in triangles and quadrilaterals, giving reasons

1. | Leaning In On The Angles - angle sum of a quadrilateral | |

2. | Tricky Triangles 2 - calculate size of angles in isosceles triangle, angle sum of a triangle | |

3. | Tricky Triangles 1 - calculate size of angles in isosceles triangle, angle sum of a triangle | |

4. | Phoebe's Quirky Quadrilateral Quandaries 1 - angle sum of a quadrilateral | |

5. | Shape Up! 7 - equilateral triangle, angle sum of triangle |