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