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A hexagonal prism.
a cylinder has 3 faces (the 2 at each end and the one that goes all the way round) and 2 edges - were the 2 ends connect to the large face.
A pentagonal prism has 15 edges. 10 of these are base edges and then 5 lateral edges. Formula : A prism with a n-sided polygons at each end will have 3n edges.
A triangular prism ! It has a triangular face at each end, a rectangular base and two adjoining rectangular faces. It actually has nine edges and six corners.
You start from the left and end at the right