Demonstration of the formula for the area of a triangle Whiteboard exercise Play

Demonstration or proof? Student activity Play

Demonstration or proof? Animation Play

Derivatives of the trigonometric functions in geometry Animation Play

Deriving the formula for the surface area of a sphere Animation Play

Difference of squares Student activity Play

Dimensions of the figure Animation Play

Dividing into a given ratio Student activity Play

Drag force Whiteboard exercise Play

Drawing a parallelogram Whiteboard exercise Play

Drawing a parallelogram and calculating its area Whiteboard exercise Play

Drawing a polygon Whiteboard exercise Play

Drawing a polygon Whiteboard exercise Play

Drawing pins Animation Play

Easy calculations Student activity Play

Eclipses Class activity Play

Eclipses Whiteboard presentation Play

Effect of concentration on the reaction rate. Rate equation Whiteboard presentation Play

Effect of concentration on the reaction rate. Rate equation Class activity Play

Eight 1-cm cubes Animation Play

Energy, power and intensity of a wave Student activity Play

Energy, power and intensity of a wave Animation Play

Estimating areas Student activity Play

Example of approximation area by rectangles Animation Play

Examples of algebraic expressions Animation Play