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11.2 Chapter summary (EMA7G)

We can define three trigonometric ratios for rightangled triangles: sine (\(\sin\)), cosine (\(\cos\)) and tangent (\(\tan\)).

Trigonometry is used to help us solve problems in two dimensions that involve rightangled triangles, such as finding the height of a building.

The angle of elevation is the angle formed by the line of sight and the horizontal plane for an object above the horizontal plane.

The angle of depression is the angle formed by the line of sight and the horizontal plane for an object below the horizontal plane.
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