Tetrahedron
A 3d shape can have infinite sides
it is a 3D shape and has 4 sides
No 3D shape with FLAT SIDES has exactly 3 faces. 4 is the minimum.
A pyramid. Triangular base and three connected sides equal a pyramid.
A right square based pyramid.
A tetrahedron has four equilateral triangles as sides
sides are the face of a 3d shape and verticies are the corner of the shape
square
That is a Dodecahedron.
tetrahedron is a 4 faced 3d shape.
A septadecahedron has 17 sides to it.