Mathematics

In figure, $$POQ$$ is a line, then $$a$$ is equal to 


ANSWER

$$80^o$$


SOLUTION
We can see in the given figure, $$POQ$$ is a straight line 
$$\therefore \angle ROQ +\angle POR=180^o$$
$$\Rightarrow 100^o +a=180^o$$
$$\Rightarrow a=180^o-100^o$$
$$\Rightarrow a=80^o$$
Hence, Option $$C$$ is correct.

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