A) Both squares and parallelograms have four sides altogether, meaning they are quadrilaterals.

B) Squares and parallelograms have parallel opposite sides for when any one of the angles within both shapes are added with one of the angles adjacent to it, the result is 180 degrees.

C) This is true for if they had two pairs and still are quadrilaterals, they would be squares or rectangles. If they had no pairs of parallel sides, the shape would not be a trapezium anymore.

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