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)

Radian measure

Most people usually learn to measure an angle in degrees. But in many scientific and engineering calculations radians are used in preference to degrees. Video tutorial 24 mins.

Radian measure

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