 Hello and welcome to the session. Let us discuss the following question. Question says, explain how this figure is a trapezium. Which of its two sides are parallel? Let us now start with the solution. Now we are given that angle M is equal to 100 degrees and angle L is equal to 80 degrees. Now note that sum of angle M and angle L is equal to 180 degrees. Now note that planes N, M and K, L are intersected by a transversal M, L at two distinct points M and L. And sum of these two angles or we can say sum of interior angles on the same side of the transversal M, L is equal to 180 degrees. So this implies N, M is parallel to K, L. This is because if two lines are intersected by a transversal in such a way that interior angles on same side of transversal are supplementary then the lines are parallel to each other. Now since N, M is parallel to K, L so this quadrilateral is a trapezium. According to the definition of a trapezium, trapezium is a quadrilateral with a pair of parallel sides. So we get K, L, M, N is a trapezium since trapezium is a quadrilateral with a pair of parallel sides. So this is our required answer. This completes the session. Hope you understood the solution. Take care and keep smiling.