Which is not possible for triangle PQR and why ?
∠P = 120°, ∠Q = 40°, ∠R = 20°.

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Solution

Given - $∠ P = 120^{\circ} ∠ Q = 40^{\circ} ∠ R = 20^{\circ}$
We know that, Sum of all angles of triangle is 180°
$∠ P + ∠ Q + ∠ R 120^{\circ} + 40^{\circ} + 20^{\circ} = 180^{\circ} w h i c h i s e q u a l t o 180^{\circ} S o, t h e t r i a n g l e i s p o s s i b l e .$

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