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24 an they are all right angles
A rectangular prism has 8 vertices that form various angles
A triangular prism has two right angles. Each end of the prism, which is a triangle, has one right angle. The third right angle is formed where the two rectangular sides meet. So, in total, a triangular prism has two right angles.
A octagonal prism has 32 right angles!!!!!
Depends on the cross-sectional polygon.