Are two angles equal? Student activity Play

Comparing angles Animation Play

Course of a boat Game Play

Diffuse reflection Simulation Play

Diffuse reflection Student activity Play

Drawing an angle Whiteboard exercise Play

Drawing angles Student activity Play

How a periscope works Slideshow Play

How to draw an angle? Animation Play

How to measure an angle? Animation Play

Measuring angles Whiteboard exercise Play

Measuring angles Student activity Play

Measuring angles by using a protractor Whiteboard exercise Play

Periscopes Student activity Play

The cotangent function Whiteboard exercise Play

The tangent and cotangent functions revisited Student activity Play

The tangent function Whiteboard exercise Play

Using measuring instruments to approximate constructions Student activity Play

Using ruler and protractor to approximate constructions Simulation Play