A circle circumscribed about a triangle Whiteboard exercise Play

A circle circumscribed about a triangle Student activity Play

A circle inscribed in a triangle Student activity Play

A closer look at the sine Whiteboard exercise Play

A closer look at the trigonometric ratios Student activity Play

A diagonal of a cuboid Animation Play

A leaning tree Student activity Play

A leaning tree Whiteboard exercise 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

A polygon inscribed in a circle Student activity Play

A prism Student activity Play

A prism Slideshow Play

A prism Whiteboard exercise Play

A quadrilateral inscribed in a circle Whiteboard exercise Play

A radio tower Whiteboard exercise Play

A radio tower Student activity Play

A regular pentagon Student activity Play

A right-angled triangle Student activity Play

A right-angled triangle – adjacent side Whiteboard exercise Play

A right-angled triangle – opposite side Whiteboard exercise Play

A shortcut Animation Play

A square and a straight line Simulation Play