Pythagoras' Theorem and pizzas? The theorem is meticulously described here with an animation and extension material that brings the concept to real life (yes, using pizzas!). Among various other sections covered are sine, cosine, tangent and measurements in radians.

> Pythagoras' Theorem
> Trig ratios in a right-angled triangle
> Trig ratios of an angle of any size
> Radian measure
> Trig equations
> Trig identities
> Triangle formulae
> Cosec, sec and cot
> The addition formulae
> The double-angle formulae
> a cos x + b sin x = R cos (x - a)

Trig identities

In this unit we consider trigonometric identities and how to use them to solve trigonometric equations. Video tutorial 40 mins

Trig identities

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