The sum of the interior angles of a quadrilateral – proof Animation Play

The tangent and coordinates of the points Animation Play

The tangent and cotangent functions revisited Student activity Play

The tangent and the cotangent are inversely proportional Student activity Play

The tangent as a coordinate Animation Play

The tangent function Whiteboard exercise Play

The tangent of an arbitrary angle Student activity Play

The tangent of an arbitrary angle Whiteboard exercise Play

The tangent theorem – solving problems Whiteboard exercise Play

The tangent – reducing angles Student activity Play

The tangent – reducing angles Whiteboard exercise Play

The transversal and angles Whiteboard exercise Play

The transversal and angles Student activity Play

The trigonometric functions of the angle 90° Animation Play

The two sides and an angle between them Whiteboard exercise Play

The values of the trigonometric functions Animation Play

The work that needs to be done to pull a barrel up Whiteboard exercise Play

Theorem – assumptions and claim Whiteboard exercise Play

Theorem – assumptions and claim Student activity Play

Theorems and their assumptions in geometry Student activity Play

Thermal conduction inside a flat plate Simulation Play

Thermal conduction inside a flat plate Student activity Play

Thermal conduction inside a flat plate Whiteboard exercise Play

Time of flight for projectile motion at an angle Whiteboard exercise Play

Time of flight for projectile motion at an angle Student activity Play