Mathematics

The measure of an angle is twice the measure of its supplementary angle. Find its measure.


SOLUTION
Solution:
  Let the angle be $$X$$ 
  the supplement$$={180}^{\circ}-x$$
  According to the question
  $$x=2({180}^{\circ}-x)$$
  $$3x={360}^{\circ}$$
   $$x={120}^{\circ}$$
    Hence the angle is $${120}^{\circ}$$
 
 
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