Final answer:
The shape described with a circular base and parallel square cross sections perpendicular to the base is a cylinder. This is identified as option 4 in the set of choices provided.
Step-by-step explanation:
The shape in question, with a circular disk as the base and parallel cross sections perpendicular to the base being squares, is known as a cylinder. This three-dimensional figure maintains the circular base and top, while the sides formed by the square cross-sections stand perpendicular to the bases. To provide a specific answer to the question, the shape of s is option 4, a Cylinder.
When examining geometric shapes, it is important to recognize the properties of the figure. In this case, the circular base and the square cross-sections, which are consistent in size along the height of the object, define it as a cylinder. This is because a cylinder's cross-sectional shape remains constant along its height, as opposed to other three-dimensional figures like cones or pyramids.