Mathematics

Mathematics, 29.11.2019 22:31, dragpack70

"a quadrilateral is a trapezoid if and only if it has exactly one pair of parallel sides."

if this statement is true, then which of the following statements must also be true?

a. a trapezoid has exactly one pair of parallel sides if and only if it is a quadrilateral.
b. a quadrilateral has exactly one pair of parallel sides if and only if it is a trapezoid.
c. a quadrilateral is not a trapezoid if and only if it has exactly one pair of parallel sides.
d. a quadrilateral does not have exactly one pair of parallel sides if and only if it is a trapezoid.

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"a quadrilateral is a trapezoid if and only if it has exactly one pair of parallel sides."

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