If the two angles of a triangle PQR are 50° and 30° respectively, find the third angle of the given triangle.

75°

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80°

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90°

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100°

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Solution

The correct option is D 100°
We know,
The sum of ∠P, ∠Q and ∠R of a triangle PQR equals to 180°.
i.e,
∠P + ∠Q + ∠R = 180°.
∠R + 50° + 30° = 180°
∠P =180°- 80°
∠P = 100°

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