No.
A normal trapezium has two parallel sides that are not equal in length, and two other sides joining the ends of the parallel sides which may be equal, but are usually not.
If all four sides of a trapezium were equal in length, it would be called a rhombus as the sides would be parallel in pairs; and if the angles were 90° as well, it would be called a square.
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All the sides of a trapezium are not equal. Only two sides, which are not parallel, of a trapezium can be equal and such type of trapezium is called isosceles trapezium.
does any isosceles trapezium have any equal sides?if yes,which?
It can do. The non-parallel sides of an isosceles trapezium will be equal. Also, one of the non-parallel sides could be equal to one of the parallel sides.
No
A trapezium, also called a trapezoid. It is possible that one of the parallel sides of the trapezium is equal to one of the slant side. In that case the trapezium has no special name but if the two slant sides are equal, the figure would be an isosceles trapezium.