Answer:
\[\because \] \[\,\angle KLM\,+\angle NML\,={{80}^{\text{o}}}+{{100}^{\text{o}}}={{180}^{\text{o}}}\] \[\therefore \] \[KL||NM\] | i.e., the sum of interior opposite angles is \[{{180}^{\text{o}}}\] \[\therefore \] Figure KLMN is a trapezium.
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