Question

In the figure given below, lines RS and PQ intersect each other at point O.
$\text{If}\angle POR:\angle ROQ=11:13,$
find $\angle SOQ$.

• A. ${95}^{\circ }$
• B. $(\frac{165}{2}{)}^{\circ }$
• C. ${65}^{\circ }$
• D. $(\frac{195}{2}{)}^{\circ }$

Answer 1

The correct option is B

$(\frac{165}{2}{)}^{\circ }$

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

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