As I have already answered to your previous identical question, the answer is a triangular based pyramid. Please do not post the same question over and over again if you do not get an answer immediately, as this will only result in irritating the people who strive to help people like you.
# of faces + # of edges + # of vertecies + 2
Sphere
According to Euler none; for all 3d shapes: Vertices + Faces = Edges + 2 ⇒ 12 + 8 = 19 + 2 ⇒ 20 = 21 So unless 20 does equal 21, no 3d shape has 8 faces, 19 edges and 12 vertices. Any 3d shape with 8 faces would be an octahedron.
A pyramid
Hexagonal prism
retangle
Sphere ( 0 faces , 0 edges , 0 vertices )
# of faces + # of edges + # of vertecies + 2
Sphere
According to Euler none; for all 3d shapes: Vertices + Faces = Edges + 2 ⇒ 12 + 8 = 19 + 2 ⇒ 20 = 21 So unless 20 does equal 21, no 3d shape has 8 faces, 19 edges and 12 vertices. Any 3d shape with 8 faces would be an octahedron.
It is a square based pyramid that has 5 faces, 8 edges and 5 vertices
That 3D shape is called triangular pyramid.
cube
a square
Nonahedron
tetrahedron
corn