A parallelogram has sides of 8 yards and 10 yards and an angle that measures 60 degrees. What is the area of the parallelogram?
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Pythagorean theorem is 
and using that sin is opposite/hypotenuse, you can find the third side of the triangle.
now you know adjacent is 60, so cos=60/61
and using that sin is opposite/hypotenuse, you can find the third side of the triangle.
now you know adjacent is 60, so cos=60/61