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Different topics are taught in different countries at various ages.

I expect that the main formulae will be the definitions of sine and cosine ratios in the context of right angled triangles, the tangent ratio - either from a right angled triangle or in as derived from sine and cosine. There will also be the squared ratios identity. In year 10 or 11, pupils will learn the sine and cosine rules for general (non-right angled) triangles, and the area of a segment of a circle.

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9y ago

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