Question

In the figure below, lines RS and PQ intersect each other at point O. If

$\angle POR:\angle ROQ=11:13$,

find $\angle SOQ$.

• A.
• B.
• C.
• D.

Answer 1

The correct option is A

$\angle POR+\angle ROQ={180}^{\circ }$ (linear pair of angles)

but, $\angle POR:\angle ROQ=11:13$ (given)

$\angle POR=\frac{11}{24}\times {180}^{\circ }=(\frac{165}{2}{)}^{\circ }$

Similarly, $\angle ROQ=\frac{13}{24}\times {180}^{\circ }=(\frac{195}{2}{)}^{\circ }$

Now, $\angle POS=\angle ROQ=(\frac{195}{2}{)}^{\circ }$ (vertically opposite angle)

And, $\angle SOQ=\angle POR=(\frac{165}{2}{)}^{\circ }$ (vertically opposite angle)