Answer:
Parallelogram, Rhombus, Rectangle, and Square.
Explanation:
There are 4 quadrilaterals that satisfy the conditions of the opposite sides being equal and the opposite sides being parallel: Parallelogram, Rhombus, Rectangle, and Square.
Parallelogram consists of two pairs of parallel lines. The opposite sides are both parallel and equal. However, all sides are not equal.
Rhombus consists of two pairs of parallel lines. The opposite sides are both parallel and equal. However, all sides are equal.
Rectangle consists of two pairs of parallel lines. The opposite sides are both parallel and equal. The adjacent lines are perpendicular to each other. However, all sides are not equal.
Square consists of two pairs of parallel lines. The opposite sides are both parallel and equal. The adjacent lines are perpendicular to each other. However, all sides are equal!!!