A rhombus has sides of length 10cm, and the angle between two adjacent sides is 76°. Find the length of the longer diagonal of the rhombus
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Let the length of one of the diagonals be 2x and the other be 2y, then
cos (76/2) = x/10
x = 10 cos 38 = 7.88 cm
sin (76/2) = y/10
y = 10 sin 38 = 6.16 cm
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