There are more than 8 square based pyramids, so it is not clear which ones you are thinking of.
5 faces, 4 lateral faces, 1 base, 5 vertices, 8 edges.
8
There are lots of different types of pyramids but a square based pyramid has 5 faces, 5 corners and 8 edges
To construct an octahedron using square pyramids, you need a total of 8 square pyramids. Each pyramid can be placed with its base facing outward, sharing a vertex at the center of the octahedron. This arrangement allows the pyramids to form the eight triangular faces of the octahedron.
A Cube or Hexahedron
Triangular prisms and square-based pyramids have 5 faces. Trapezoid prisms and cubes have 6 faces. Hexagonal prisms and octahedrons have 8 faces.
They have 5 sidesThey have 4 triangular faces and one square faceThe square face is on the bottomThey have 8 edgesThey have 5 verticies
Think about 3-D shapes.Eight equilateral triangles would form two square based pyramids stuck together.Count all the lines of the shape.It will have twelve lines which would be enough lines for twelve matchsticks.
An octahedron: two quadrilateral based pyramids with their bases together.
There are 8 edges in a Square Based Pyramid!
A cuboid has 8 vertices - whether it is square-based or not.
A square based pyramid has 8 edges and 5 faces.