Diagonals of polygons Student activity Play

Diagonals of polygons Whiteboard exercise Play

Difference of squares Student activity Play

Diffraction of sound waves Student activity Play

Diffraction of sound waves Animation Play

Diffraction of sound waves Whiteboard exercise Play

Diffraction of sound waves Animation Play

Dividing an n-sided polygon into triangles Animation Play

Dividing the polygon into triangles Whiteboard exercise Play

Do you remember what a polygon is? Student activity Play

Doilies in the shape of polygons Whiteboard exercise Play

Doppler effect Class activity Play

Doppler effect Whiteboard presentation Play

Doppler effect for different waves Whiteboard exercise Play

Doppler effect for different waves Student activity Play

Dot plot Student activity Play

Drawing a polygon Whiteboard exercise Play

Drawing a polygon Whiteboard exercise Play

Drawing a square inscribed in a circle Student activity Play

Effect of concentration – a microscopic view Student activity Play

Einstein's formula Animation Play

Einstein's formula Student activity Play

Einstein's formula Whiteboard exercise Play

Electromagnetic spectrum Animation Play

Electromagnetic waves Animation Play