Sum of two adjacent angles of a parallelogram Animation Play

Supplementary, vertical, corresponding and alternate angles Student activity Play

Supplementary, vertical, corresponding and alternate angles Whiteboard exercise Play

The Angle–Side–Angle property – observations and generalisation Student activity Play

The distance between the points Animation Play

The distance formula Student activity Play

The skeleton Student activity Play

The skeleton and vital organs Animation Play

Theorem – assumptions and claim Student activity Play

Theorem – assumptions and claim Whiteboard exercise Play

Trigonometric ratios in a right-angled triangle Student activity Play

Trigonometric ratios in a right-angled triangle Whiteboard exercise Play

"Two hearts" during physical effort Animation Play