sphere
square
A pyramid is a solid shape that has a square at the bottom of it and it is surrounded by 4 triangles and has a point at the top.this is a pyramid!
square-based pyramid
it is a plane shape because you said its a square
A square pyramid.
You can make square pyramid.
A square-based pyramid
The Platonic solid known as an octahedron would fit the given description
A pyramid. The square being the base and the triangles the 'sides' - each having a side connected to a side of the square - the other sides connected to 'neighbor-triangles'.
Its name is called a square based pyramid.
both are solid.Cube is 3D while square is 2D.cube is used to describe solid shape in 3Dwhile square is used to describe the shape of the surface which is only 2D
A star