**Demonstrate that the angle sum of a triangle is 180° and use this to find the angle sum of a quadrilateral (ACMMG166)**

**LO: To demonstrate that the angle sum of a triangle is 180 degrees.**

**Know:**

- That different types of triangles exist.
- What sides and angles are.

**Understand:**

- That triangles have a angle sum of 180 degrees.

**Do:**

- I can find the missing angle of a triangle.
- I can find the angle sum of a quadrilateral.