Question

question number 18????

Answer 1

Hi friend,
Here is your answer,______________________________________________________________
If AOB is a straight line then ∠AOB =180°

∠AOC = 3x

∠COB = 7x + 20°

∠AOC+∠COB = ∠AOB
3x + 7x + 20°  = 180°
10x                 = 160°
x                     = 16°

For x = 16° AOB will be a straight line.
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