Monash University researchers have extended Descartes’ Circle Theorem by finding a general equation for any number of tangent ...

Circle theorems are properties that are true ... the angle at the centre is 180° and the angle on the circumference is half the angle in the centre, 90°. More simply, opposite angles in a ...

The activities focus on spatial reasoning and geometry, which are often taught during the last few months of the school year, and which provide important foundations for mathematics reasoning more ...