**facts**) to convey our thinking (

**reasoning**) through reading, writing and speaking (

**language**).

- adjacent complementary angles
- adjacent supplementary angles
- angles at a point
- vertically opposite angles
- corresponding angles, || lines
- alternate angles, || lines
- co-interior angles, || lines
- angle sum of a triangle
- exterior angle of a triangle
- equal sides of an isosceles (or equilateral) triangle
- equal angles of an isosceles (or equilateral) triangle
- angle sum of a quadrilateral