Ratio - At Right Angles Pullout

How does one introduce a topic like ratio, which is so widely present in daily life and so intimately connected with human experiences? Our cherished cultural achievements are permeated with it: music is full of ratios, as is art. Our daily existence involves cooking and shopping, and these are filled through and through with the usage of ratio. Shadows, which are present with us all through the day, offer a visual depiction of ratios in action. In mathematics as a subject, the notion of ratio is embedded into many topics – sometimes in an obvious way, at other times not so. Fractions, scale drawing, enlargement, trigonometry, tables, linear equations... are all illustrations of this.

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