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If the prism is based on regular decagons and it is a right prism, all 12 faces.
There are a number of polygons that are similar to it but if you mean things that look like decagons than nonagon, undecagon, dodecagon, and octagon.
measure the perimeter then measure from the EXACT center to a side multiply this only works on regular decagons!
all decagons have 1440 degrees
NO! Only REGULAR Pentagons. All equilateral triangles are similar!!!