Select the diagram showing a pair of parallel lines:
Select the diagram showing a pair of parallel segments:
Select the diagram showing a pair of corresponding angles:
Explore angle relationships and establish informal arguments.
Derive the sum of the interior angles of a triangle.
Explore the relationship between the interior and exterior angles of a triangle.
Construct and explore the angles created when parallel lines are cut by a transversal.
Use the properties of similar figures to solve problems.