The figure, given alongside, shows two adjacent angles AOB
and AOC whose exterior sides are along the same straight
line. Find the value of x.
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Sum of angles on a straight line always 180.
=> 68° + 3x -20° =180
=> 3x = 180 +20 - 68
=>. 3x = 132
=> X = 132/3
=> x = 44
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