Two circles and a line Whiteboard exercise Play

Two circles externally tangent Whiteboard exercise Play

Two circles internally tangent Whiteboard exercise Play

Two internally tangent circles Whiteboard exercise Play

Two parallel tangents to a circle Whiteboard exercise Play

Two points of view on the same problem Whiteboard exercise Play

Two points of view on the same problem Student activity Play

Using a ruler and a compass Animation Play

Using exact values Student activity Play

Using ITC in calculations Whiteboard presentation Play

Using ITC in calculations Class activity Play

Using tangent theorems Whiteboard exercise Play

Using tangent theorems Student activity Play

Using the basic constructions Student activity Play

Using the distance formula Animation Play

Valid and invalid deduction Animation Play

Volume of a cylinder Whiteboard exercise Play

Volume of a cylinder Student activity Play

What are similar shapes? Student activity Play

What can we do with a ruler and a compass? Simulation Play

What can we do with a ruler and a compass? Student activity Play

What is the radius? Whiteboard exercise Play

What is the radius? Student activity Play

Which quadrant is the circle in? Simulation Play

Which quadrant is the circle in? Student activity Play