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प्रश्न
In the given figure, the directed lines are parallel to each other. Find the unknown angles.
उत्तर
∵ Lines are parallel
∴ c = 120°
a + 120° = 180° .......(co-interior angles)
∴ a = 180°− 120° = 60°
But a = b .........(vertically opposite angles)
∴ b = 60°
hence a = 60°, b = 60° and c = 120°
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