16-square-cm square Whiteboard exercise Play

4-square-inch square Whiteboard exercise Play

A car moving at constant speed Animation Play

A cardboard model of a prism Animation Play

A carpet problem Animation Play

A circle circumscribed about a regular pentagon Whiteboard exercise Play

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 circumference Animation Play

A copper wire Animation Play

A cylinder Student activity Play

A cylinder Whiteboard exercise Play

A folded sheet of paper Animation Play

A fraction as a percentage Whiteboard exercise Play

A fraction as a percentage Student activity Play

A maximum area Whiteboard exercise Play

A more difficult problem Student activity Play

A more difficult problem Whiteboard exercise Play

A more difficult problem (1) Student activity Play

A more difficult problem (2) Student activity Play

A parcel of land Whiteboard exercise Play

A path around a park pond Animation Play

A polygon inscribed in a circle Student activity Play

A puzzle on a painted cube Student activity Play