Area of a Triangle. A formula for finding the area of a triangle when given the measures of the angles and one side is area =
,where a is the length of the side opposite angle A. If the measures of angles B and C are 13 °and 71° , respectively, and if a = 9 feet, use the appropriate product-to-sum identity to change the formula so that you can solve for the area of a triangle. Round your answer to two decimal places.
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