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Rby · Answer 1 · 2019-10-18T03:11:40+0000

see the attached figure with the letters

cos (alfa)=2/dAB
and
cos(alfa)=dAB/(6+2)
2/dAB=dAB/8---------------- > dAB²=16-------------- > dAB=4

x²+2²=dAB²-------------- > x²=dAB²-2²=(4)²-4=16-4=12
x=2√3

the answer is x=2√3 units

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