Checking the triangle Animation Play

Circles inscribed and circumscribed around a trapezium Student activity Play

Constructing right angle triangle Animation Play

Different angles Student activity Play

Distance formula in 3-dimensional space Student activity Play

Distance to the horizon Animation Play

Equation of a circle Animation Play

Find the angle Whiteboard exercise Play

Finding heights Student activity Play

Finding lengths Student activity Play

Finding sides Whiteboard exercise Play

Finding sides Student activity Play

Formula for the diagonal of a square Animation Play

Formula for the height of the equilateral triangle Animation Play

Geometric problem Whiteboard exercise Play

Geometric problems Student activity Play

Hot-air balloons Animation Play

How far is the horizon? Student activity Play

Identities in trigonometric equations Animation Play

Match a triangle Whiteboard exercise Play

Match a triangle Student activity Play

Miscellaneous problems Student activity Play

Proving trigonometric identity using the Pythagorean identity Whiteboard exercise Play

Pythagoras' theorem – geometric proof Whiteboard exercise Play

Pythagoras' theorem – geometric proof Student activity Play