Two inequalities in a coordinate system Animation Play

Two internally tangent circles Whiteboard exercise Play

Two more quadrilaterals Student activity Play

Two parallel tangents to a circle Whiteboard exercise Play

Two perpendicular symmetry lines Animation Play

Undefined gradient Animation Play

Unit vectors in a vector equation of a line Animation Play

Unknown angle in a triangle Animation Play

Using a ruler and a compass Animation Play

Using ITC for comparing data Whiteboard presentation Play

Using ITC for comparing data Class activity Play

Using ITC for data presentation Class activity Play

Using ITC for data presentation Whiteboard presentation Play

Using ITC in calculations Whiteboard presentation Play

Using ITC in calculations Class activity Play

Using measuring instruments to approximate constructions Student activity Play

Using ruler and protractor to approximate constructions Simulation Play

Using ruler and set-square to approximate constructions Simulation Play

Using tangent theorems Whiteboard exercise Play

Using tangent theorems Student activity Play

Using the basic constructions Student activity Play

Using the calculator Student activity Play

Using the calculator Whiteboard exercise Play

Using the difference identity for the tangent Whiteboard exercise Play

Using the double-angle formulas for the tangent to rewrite cosine Whiteboard exercise Play