10. Explain how this figure is a trapezium. Which of its two sides are parallel? (Fig 3.32)

Given, $\angle M+\angle L=100\degree+80\degree$$180\degree$.

A transverse line is intersecting two lines such that sum of angles on same side of transversal line is $180\degree$.

And hence, lines KL and MN are parallel to each other.

Quadrilateral KLMN has a pair of parallel lines so it is a trapezium.

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