If it is a parallelogram, then it has two sets of parallelogram sides.
Parallelograms' opposite angles are congruent
A parallelogram's bisectors are congruent.
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A parallelogram's bisectors are NOT congruent.
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An oblong, a parallelogram and a quadrilateral
An oblong, a quadrilateral and sometimes a parallelogram
I can use it when lines are joined together
A parallelogram must have 4 sides and so it must be a quadrilateral. However, the sides of a quadrilateral need not be parallel so a quadrilateral need not be a parallelogram.
A quadrilateral is a polygon with four sides. A parallelogram is a quadrilateral in which the opposite sides are parallel.