what is the condition required for a quadrilateral to show that the quadrilateral is a trapezium..?
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Explanations (2) One way to prove that a quadrilateral is an isosceles trapezoid is to show: The quadrilateral has two parallel sides. The lower base angles are congruent and the upper base angles are congruent.
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at least one pair of opposite sides are parallel. ... Parallelogram: a quadrilateral with two pairs of parallel sides. Equivalent conditions are that opposite sides are of equal length; that opposite angles are equal; or that the diagonals bisect each other.
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