I think 11 faces
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A pentagonal pyramid has 5 triangular faces as well as a base. Depending on if you include the base or not it would have 5-6 faces.
An octagonal pyramid has 8 faces. * * * * * No. An octagonal pyramid has 9 faces - one octagonal base and 8 triangular faces meeting at an apex above the base.
5 faces
A pyramid shape, by default, has a square base. It therefore has 5 faces.
The 3D shape you are describing is a pentagonal pyramid. It has a pentagonal base with five sides, and five vertices where the triangular faces meet. The three rectangle faces are lateral faces that connect the triangular base to the apex of the pyramid. The pentagonal pyramid is a type of pyramid with a polygonal base and triangular faces.