How much bigger? Animation Play

How to draw a triangle symmetrical to a given point Animation Play

How to find a square root Animation Play

How to get a nonagon from a square? Whiteboard exercise Play

Imperial units of area Student activity Play

Imperial units of area Animation Play

Impossible constructions Animation Play

Inequalities Class activity Play

Inequalities Whiteboard presentation Play

Inscribed circles, circumscribed polygons Student activity Play

Inscribing a square into a circle Whiteboard exercise Play

Inverse square proportion Student activity Play

Inverse square proportion Whiteboard exercise Play

Irrational numbers Whiteboard exercise Play

Is a practical demonstration reliable? Student activity Play

Is it a square? Student activity Play

Is it a square? Whiteboard exercise Play

John's lawn Whiteboard exercise Play

Lena's way Animation Play

Length constructions Student activity Play

Length contraction (Lorentz-Fitzgerald contraction) Student activity Play

Length contraction (Lorentz-Fitzgerald contraction) Whiteboard exercise Play

Let's investigate perimeters and areas Student activity Play

Like terms Student activity Play

Magic square Animation Play