a parallelogram is a quadrilateral whose opposite sides are not equal.
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false,This answer is false
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A simple (non-self-intersecting) quadrilateral is a parallelogram if and only if any one of the following statements is true: Two pairs of opposite sides are parallel (by definition). Two pairs of opposite sides are equal in length. Two pairs of opposite angles are equal in measure.
Area: b × h (base × height); ab sin θ (product of adjacent sides and sine of the vertex ...
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