Find the measures of $ \angle \mathrm{POR} $.
"
Given:
$\angle ROQ=90^o$.
To do:
We have to find the measure of $\angle POR$.
Solution:
We know that,
The sum of the angles of a linear pair is $180^o$.
In the given figure, $\angle POR$ and $\angle ROQ$ form a linear pair.
Therefore,
$\angle POR+\angle ROQ=180^o$
$\angle POR+90^o=180^o$
$\angle POR=180^o-90^o$
$\angle POR=90^o$.
The measure of $\angle POR$ is $90^o$.
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