Mathematics

An angle is two-thirds of its supplementary angle. Find the angle. 


SOLUTION
Let the angle be $$\theta$$.
$$\therefore$$    $$\theta =\dfrac { 2 }{ 3 } \left( 180-\theta  \right) $$
$$\Rightarrow 3\theta =360-2\theta $$
$$\Rightarrow 5\theta =360\Rightarrow \theta ={ 72 }^{ 0 }$$
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