# VCMMG263

Demonstrate that the angle sum of a triangle is 180 degrees and use this to find the angle sum of a quadrilateral

 1 Tri-Trip - angle sum of a triangle 2 Tri-trip Terry - angle sum of a triangle 3 Top Of The Tower Triangle - calculate size of angles in isosceles triangle, angle sum of a triangle 4 Ancient Angles - calculate size of base angles in isosceles triangle, angle sum of a triangle 5 Angling With Ants - calculate angle size, angle sum of a triangle 6 Leaning In On The Angles - angle sum of a quadrilateral 7 ABCs 1 - triangle geometry, equal angles opposite equal sides 8 Tricky Triangles 4 - calculate reflex angle of equilateral triangle 9 Tricky Triangles 3 - calculate size of angles in isosceles triangle, angle sum of a triangle, reflex angles 10 Shape Up! 7 - equilateral triangle, angle sum of triangle 11 Phoebe's Triangle Theorems 1 - angle sum of a triangle 12 Shape Up! 4 - calculate size of angles in isosceles triangle, angle sum of a triangle 13 Shape Up! 1 - exterior angles of a triangle