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Mathematics 7 Online
OpenStudy (anonymous):

I need help with the following question. Can someone help me, please? A rhombus has sides of length 10 cm, and the angle between two adjacent sides is 76*. Find the length of the longer diagonal of the rhombus.

OpenStudy (anonymous):

the measure of each of greater angles is (360-2X76)/2 =104 ; the longer diagonale is the one that is opposite to the greater angle so bya using cos rule the square of the length of the longer diagonal = 10^2 + 10^2 -2X10X10Xcos(104)

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