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What is a parallelogram? Are squares and rectangles parallelograms? (Math problems in the second grade of primary school)
Parallelogram has the following definitions:

☆? Two groups of quadrangles with parallel opposite sides on the same plane are called parallelograms.

☆? Two groups of quadrangles with equal opposite sides on the same plane are called parallelograms.

☆? A group of quadrilaterals with parallel and equal opposite sides on the same plane is called parallelogram.

☆? A group of quadrangles with equal diagonal angles on the same plane is called parallelogram.

Square and rectangle are special parallelograms.