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Octagons have no perpendicular lines.
There are regular octagons, and irregular octagons.
Vertices don't have octagons but octagons have vertices. Assuming this is what you meant, 8.
no
Strictly speaking, no, because a semi-regular tessellation must be based on regular polygons and rhombi are not regular polygons. However, octagons and rhombi can be used to make a non-regular tessellation.