All polygons have adjacent sides. Adjacent simply means "next to".
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Yes, trapeziums have adjacent sides. A trapezium is a four-sided shape, and 'adjacent' just means 'next to'. Each side of a trapezium has two sides which are next to it.All polygons have adjacent sides. Adjacent simply means "next to".
2(Adjacent) * * * * * You cannot have a polygon with two sides! A trapezium has four sides - whether it is isosceles or not.
A trapezium does not have to have adjacent sides equal, but might have. In the US, trapezium just means any old four-sided shape. Outside the US, it means a shape with at least two parallel sides.
It could be a square, rhombus, trapezium, kite or arrowhead.
The adjacent sides of very few quadrilaterals are equal. This is most common in the square and the rhombus, but does not often happen in quadrilaterals such as the kite, the delta, the rectangle or the trapezium.