A line going through two points Animation Play

A line in 3-D going through two points Simulation Play

A line of symmetry and a rotation through 90° Animation Play

A line passing through two points Simulation Play

A perpendicular through a point off the line Simulation Play

A perpendicular through a point off the line Student activity Play

A perpendicular through a point on the line Simulation Play

A perpendicular through a point on the line Student activity Play

Absorption of lipids through the intestinal wall Animation Play

An image through a camera Animation Play

Blood flow through the organs Slideshow Play

Chord bisector goes through the centre Animation Play

Chord bisector goes through the centre Student activity Play

Construction of a tangent to a circle through a point not on the circle Animation Play

Cross-section through the trachea Illustration Play

Effect of physical activity on blood flow through the organs; cardiac output and stroke volume Student activity Play

Electron transfer through photosystems Whiteboard exercise Play

Energy flow through food chains Animation Play

Flow of charge through a substance Whiteboard exercise Play

Flow of charge through a substance Student activity Play

Flow of charge through a substance Simulation Play

Flow of energy through a food chain Slideshow Play

Flow of energy through the components of an ecosystem Simulation Play

How does light pass through a prism? Animation Play

How long does it take for energy to pass through an ecosystem? Slideshow Play