one angle of a rhombus is 60 degrees and side = 10cm, find the length of longer diagonal is
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x 2 = 1 0 2 + 1 0 2 − 2 ( 1 0 ) ( 1 0 ) cos 1 2 0
x 2 = 2 0 0 − 2 0 0 ( 2 − 1 )
x 2 = 3 0 0
x = 3 0 0 = 1 0 3