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

Diminution Animation Play

Dividing an equilateral triangle Animation Play

Dividing an equilateral triangle into nine congruent triangles Whiteboard exercise Play

Dividing an n-sided polygon into triangles Animation Play

Dividing into a given ratio Student activity Play

Dividing the polygon into triangles Whiteboard exercise Play

Do you remember what a polygon is? Student activity Play

Does the triangle exist? Whiteboard exercise Play

Doilies in the shape of polygons Whiteboard exercise 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 a triangle symmetrical to a point Student activity Play

Drawing a triangle symmetrical to a point Whiteboard exercise Play

Drawing an equilateral triangle Animation Play

Drawing an equilateral triangle inscribed in a circle Student activity Play

Drawing an equilateral triangle inscribed in a circle Whiteboard exercise Play

Drawing pins Animation Play