You need to use a protractor to measure the two angles at the ends of the base. The other two angles will be their supplements.
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In a trapezium, there are two perpendicular lines. These perpendicular lines are the diagonals of the trapezium. The diagonals of a trapezium are the line segments that connect non-adjacent vertices of the trapezium and intersect each other at a right angle.
The largest angle of a trapezium can be any value just less than 180 degrees.
It could be a kite, a trapezium, a chevron or just an irregular quadrilateral with one right angle and no specific name.
Well, honey, a trapezium can have 0, 1, or 2 obtuse angles. It all depends on the specific shape of the trapezium. So, you might want to whip out that protractor and start measuring those angles if you're curious.