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Why is a parallelogram not the same type of quadrilateral as a trapezoid

User MHop
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A quadrilateral with the opposite side lines parallel is known as a parallelogram. If only one pair of opposite sides is parallel, the shape is a trapezoid.
User TGW
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A parallelogram's sides, when extended should be parallel to the side opposite of it. When a trapezoid's sides are extended, only one set of the sides are parallel, the other set is perpendicular.
User Jeanclaude
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