Prisms – parallel faces and perpendicular faces Student activity Play

Properties of diagonals in a rhombus Animation Play

Properties of diagonals in a square Animation Play

Properties of kites Animation Play

Property of a perpendicular bisector Animation Play

Regular polygons – the dodecagon Student activity Play

Regular polygons – the square Student activity Play

Regular polygons – the square Simulation Play

Ruler-and-compass constructions Class activity Play

Ruler-and-compass constructions Whiteboard presentation Play

Ruler-and-compass constructions, locus (1) Whiteboard presentation Play

Ruler-and-compass constructions, locus (1) Class activity Play

Solving problems Student activity Play

Symmetries with respect to two perpendicular lines Whiteboard exercise Play

Symmetries with respect to two perpendicular lines Student activity Play

Tangent parallel or perpendicular to a line Student activity Play

Tangent perpendicular to a line Whiteboard exercise Play

Tangent to a circle through a point not on the circle Student activity Play

The bisector of a line Student activity Play

The bisector of a line Whiteboard exercise Play

The converse of the Pythagorean theorem Student activity Play

The correct perpendicular lines Whiteboard exercise Play

The direction of the Earth's rotation Whiteboard exercise Play

The fence problem Student activity Play

The fence problem Whiteboard exercise Play