A trapezium (or trapezoid in North America) does not necessarily have any right angles. The only requirement is that it is a quadrilateral (4 sided polygon) with one pair of parallel sides.
If one of the sides is perpendicular to the bottom base, then it is also perpendicular to the top (so 2 right angles). If the other side is also perpendicular to the bottom base then it will be perpendicular to the top base as well, then it is a rectangle, with four right angles.
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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.
A trapezium has 2 obtuse and 2 acute angles.
The interior angles of a trapezium = 360°The British definition of a trapezium is a quadrilateral with one pair of parallel sides.
No, because it would then be a rectangle.
A parallelogram, a rhombus, kites, arrowheads, trapezium and irregular quadrilaterals. However, some kites, arrowheads, trapezium and irregular quadrilaterals can have one (or more) right angles.