Answer: Always true
Sometimes true (only if all four sides are congruent)
Sometimes true (only if the trapezoid is isosceles)
Always true
Sometimes true (only if it has at least one pair of parallel sides)
Sometimes true (only if all four sides are congruent and opposite angles are congruent)
Sometimes true (only if all four sides are congruent)
Sometimes true (only if it has two pairs of congruent adjacent sides)
Sometimes true (only if all four sides are congruent)
Always true.
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