Not necessarily.
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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
It could be an isosceles triangle that is not right angles; an isosceles trapezium, a trapezium where one of the parallel sides is equal to one of the sloped sides; any irregular polygon with 5 or more sides where two are equal, and no right angles.