classify the following into quadrilaterals:

triangle,rectangle,pentagon,hexagon,parralelogram

Which ones have four sides?

Rectangle

To classify the given shapes into quadrilaterals, we need to identify which shapes have four sides. Let's go through each shape one by one:

1. Triangle: A triangle is not a quadrilateral because it has three sides, not four.

2. Rectangle: A rectangle is indeed a quadrilateral because it has four sides. All four angles of a rectangle are right angles.

3. Pentagon: A pentagon is not a quadrilateral because it has five sides, not four.

4. Hexagon: Similar to the pentagon, a hexagon has six sides, so it is not a quadrilateral.

5. Parallelogram: A parallelogram is also a quadrilateral as it has four sides. Opposite sides of a parallelogram are parallel and equal in length.

In summary, the only shape in the given list that is a quadrilateral is the rectangle.