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Illustration of a parallelogram, a quadrilateral which has opposite sides parallel.

Parallelogram

Illustration of a parallelogram, a quadrilateral which has opposite sides parallel.

Illustration of a parallelogram with altitude and diagonal drawn.

Altitude and Diagonal of a Parallelogram

Illustration of a parallelogram with altitude and diagonal drawn.

Illustration of a parallelogram with diagonals drawn to show they bisect each other.

Parallelogram With Diagonals Bisecting Each Other

Illustration of a parallelogram with diagonals drawn to show they bisect each other.

Illustration of a two equal parallelograms. Two parallelograms are equal, if two sides and the included angle of the one are equal, respectively, to two sides and the included angle of the other.

Equal Parallelograms

Illustration of a two equal parallelograms. Two parallelograms are equal, if two sides and the included…