Problem 30 of 7
Use trig area formula for sides 4, 9, and included angle 120 degrees.
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apply two sides and included angle.
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Apply two sides and included angle with exact and decimal trig values.
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Solution
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1. Verify the angle is included between the two sides.
2. Substitute into A=1/2ab sin(C).
3. Evaluate exactly or approximately as requested.
Use the worked steps, then substitute the final answer back into the original relationship to confirm it satisfies the prompt.
Using a non-included angle with the two sides.