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Trigonometry in Right-Angled Triangles
by Michelle Lim
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Trigonometry in Right-Angled Triangles

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Terminology of right-angled Triangles

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Sides

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Angles of Elevation and Depression

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Trigonometrical Ratios

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Ratios

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Concepts

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Trigonometry

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Definition

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Application

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Pythagoras' Theorem

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Theorems

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Concepts

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Example Question

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Find the unknown angles and sides marked x, y and z in the figure.

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Working

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