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A polygon is 2 dimensional shape whereas a non polygon can be 3 dimensional shape
The non-parallel line of an isosceles trapezium are equal.
The ogive never close because they represent non-decreasing functions, and polygon you close it.
A supplementary angle can be either adjacent or non-adjacent.A linear pair must be adjacent and is never non-adjacent.NOTE: They both add up to 180°.
In a general trapezium, the non-parallel sides are not congruent. However, in an isosceles trapezium, the non-parallel sides are congruent. So the shape is like an isosceles triangle with its apex chopped off by a straight line parallel to its base.