Question

select all the shapes that are quadrilaterals. square octagon parallelogram hexagon

Explanation:

Step1: Recall definition of quadrilateral

A quadrilateral is a polygon with 4 sides.

Step2: Analyze each shape

A square has 4 sides, a parallelogram has 4 sides. An octagon has 8 sides and a hexagon has 6 sides.

Answer:

square, parallelogram