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The Humongous Book of Trigonometry Problems by W. Michael Kelley

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30°–60°–90° Triangles

Note: Problems 3.10–3.12 refer to the diagram below.

3.10    Given , calculate .

The interior angles of a triangle have a sum of 180°.

Note that , because R is a right angle. Substitute the measures of the two known angles into ...

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