Angles of a polygon Student activity Play

Angles of a quadrilateral – revision Student activity Play

Angles of a triangle – revision Student activity Play

Angles of polygons Student activity Play

Angles of polygons Animation Play

Angles of quadrilaterals Student activity Play

Angles of quadrilaterals Animation Play

Angles of special triangles Student activity Play

Application in geometry Whiteboard exercise Play

Application in geometry Student activity Play

Application of Harry's formula Whiteboard exercise Play

Application of the Pythagorean theorem in 2-D Class activity Play

Application of the Pythagorean theorem in 2-D Whiteboard presentation Play

Application of the Pythagorean theorem in 3-D Class activity Play

Application of the Pythagorean theorem in 3-D Whiteboard presentation Play

Application of the sine rule Animation Play

Applying the formula for the area of a triangle Student activity Play

Applying the formula for the area of a triangle Whiteboard exercise Play

Applying the Pythagorean theorem Whiteboard exercise Play

Applying the Pythagorean theorem Student activity Play

Archimedes' contemplation Animation Play

Are the two triangles similar? Animation Play

Area of a triangle Student activity Play

Area of a triangle Animation Play

Area of a triangle Whiteboard exercise Play