Five billiard balls collisions Whiteboard exercise Play

Free-body diagram Animation Play

Gradient of perpendicular lines Animation Play

Gradients of parallel or perpendicular lines Student activity Play

Gradients of parallel or perpendicular lines Whiteboard exercise Play

Gradients of perpendicular lines Whiteboard exercise Play

Gradients of perpendicular lines Student activity Play

How to calculate the magnitude of the resultant force Student activity Play

How to construct a line parallel to a given line Student activity Play

How to construct a line perpendicular to a given line Student activity Play

How to construct a line perpendicular to a given line Animation Play

How to construct a perpendicular bisector Animation Play

How to construct the perpendicular bisector of a segment Student activity Play

Increasing perpendicular distances Whiteboard exercise Play

Inscribed circles, circumscribed polygons Student activity Play

Kites Student activity Play

Mutual position of a circle and a line Student activity Play

Mutual position of lines and interior angles in a triangle Class activity Play

Mutual position of lines and interior angles in a triangle Whiteboard presentation Play

Parallel and perpendicular edges in the cube Whiteboard exercise Play

Parallel and perpendicular edges in the cube Animation Play

Parallel and perpendicular edges in the cuboid Animation Play

Parallel and perpendicular edges in the prism Animation Play

Parallel and perpendicular edges on the net of the cube Whiteboard exercise Play

Parallel and perpendicular edges on the net of the cuboid Whiteboard exercise Play