Question
Find the value of the unknown angle :
✓
Answer
We know that the exterior angle of a triangle is equal to the sum of the interior opposite angles.
$\begin{array}{l}\text { In } \triangle PQR , \angle PRS =\angle PQR +\angle QPR \\ \text { So }, 140^{\circ}= x +120^{\circ} \\ x =140^{\circ}-120^{\circ} \\ x =20^{\circ}\end{array}$
$\begin{array}{l}\text { In } \triangle PQR , \angle PRS =\angle PQR +\angle QPR \\ \text { So }, 140^{\circ}= x +120^{\circ} \\ x =140^{\circ}-120^{\circ} \\ x =20^{\circ}\end{array}$
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