\"\"

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In \"\", the measure of \"\" is \"\" and \"\".

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To find: b. \ \

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1. \"\"                     (Use pythagorean theorem) \ \

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\"\"                    (Substitue: \"\")

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\"\"               (Square: \"\")

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\"\" (Subtract \"\" to each side)

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\"\"                                (Subtract: \"\")

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\"\"                             (Square root to each side)

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\"\"                                     (Square root: \"\")

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\"\"

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2. \"\"               (Definition of tangent ratio) \ \

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\"\"                 (Substitue: \"\")

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\"\"               (Substitue: \"\")

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\"\" (Multiply \"\" to each side)

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\"\"           (Cancel common terms)

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\"\"                   (Multiply: \"\")

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\"\".

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\"\"

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3. \"\"              (Definition of sine ratio)

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\"\"               (Substitue: \"\")

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\"\"              (Substitue: \"\")

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\"\" (Multiply \"\" to each side)

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\"\"          (Cancel common terms)

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\"\"                  (Multiply: \"\")

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\"\".

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\"\"

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4. Find \"\".

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\"\"

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\"\"                (Definition of cosine ratio)

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\"\"             (Substitue: \"\")

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\"\"             (Substitue: \"\")

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\"\" (Multiply \"\" to each side)

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\"\"         (Cancel common terms)

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\"\"                 (Multiply: \"\")

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\"\".

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\"\"

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The value of b is \"\".