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10.Explain how this figure is a trapezium. Which of its two sides are parallel?


Answer :

We have, \(∠M + ∠L = 100^{\circ} + 80^{\circ} = 180^{\circ}\)
∠M and ∠L are the adjacent angles, and sum of adjacent interior angles is \(180^{\circ}\) and also KL is parallel to NM.Hence KLMN is a trapezium.

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