Mathematics

The measure of an angle which is four times its supplement is 


ANSWER

$$144^o$$


SOLUTION
Option (b) is correct.
Let $$y$$ be the angle and its supplement is $$180^o -y$$
$$ACQ$$,
$$\Rightarrow y=4(180^o -y)$$
$$\Rightarrow y=720^o -4x$$
$$\Rightarrow 720^o =5y$$
$$\Rightarrow y=\dfrac{720^o}{5}$$
$$\Rightarrow y=144^o$$
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