Polygons (K-A)

Angles in a triangle sum to 180° proof-video (K-A)

Intro to quadrilateral (K-A)

Kites as a geometric shape (K-A)

Proof: Opposite angles of a parallelogram- video (K-A)

Proof: Opposite sides of a parallelogram-video (K-A)

Quadrilateral properties (K-A)

Quadrilateral types (K-A)

Sum of interior angles of a polygon (K-A)

Sum of the exterior angles of a polygon (K-A)

Triangle angle challenge problem 2 (K-A)

Triangle angles review (K-A)

Triangle exterior angle example (K-A)

Triangle inequality theorem (K-A)

Worked example: Triangle angles (diagram) (K-A)

Worked example: Triangle angles (intersecting lines) (K-A)