Barron's SAT Math IIC Page 86 Find the length of the longer diagonal of a parallelogram if the sides are 6 inches and 8 inches and the smaller angle is 60 degrees. Should it be like law of cosine c^2=a^2+b^2-2abcos60?
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c is the longer diagonal ... $\displaystyle c^2=a^2+b^2-2ab\cos(120)$
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