Well if the top it pointed i would call it a pyramid.
A shape with a square base and four triangular sides is a pyramid.
A square based pyramid.
Square Pyramid
A square pyramid. One base, and 4 sides.
cube
A rhombus has no base. It is flat.
A shape with a square base and four triangular sides is a pyramid.
A square based pyramid.
Square Pyramid
A square pyramid. One base, and 4 sides.
The base being the bottom of a shape. A pyramid with a square base has 4 sides. A pyramid with a triangular base has 3 sides.
cube
A Square Pyramid.
a square pyramid
The perimeter of a rhombus is the sum of its 4 equal sides
square rectangular It can be any polygon shape, depending on how many sides the pyramid has. A four sided pyramid would have a quadrilateral (like a square or a rectangle) base, for instance.
Pyramids are classified by the shape of their base. A triangular pyramid has a triangular base and three triangular side faces. A square pyramid has a square base and four triangular sides. A pentagonal pyramid has a pentagonal base and five triangular sides. A hexagonalpyramid has a hexagonal base and six triangular sides, and so on.