Mathematics

An angle is equal to one-third of its supplement. Find its measure.


SOLUTION
Let angle be $$\dfrac{x}{3} $$, then its supplementary will be x
$$x + \dfrac{x}{3} = \dfrac{4}{3} x = 180$$
$$x = 135^o$$
$$\dfrac{135}{3} = 45^o$$ is measure of angle.
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