Final answer:
The base of solid cones is a circular shape. Cones have a round base that tapers to a point called the apex at the top. For Aunt Poly's worship ground, each cone has a circular base.
Step-by-step explanation:
The geometric shape of the base of solid cones is a circle. Cones are three-dimensional shapes that have a circular base and come to a point at the top, which is known as the apex or vertex.
When looking at a cone from the top or the bottom, it is clear that the base is perfectly round. In the case of Aunt Poly's family worship ground, each cone would have this circular base.