"Pentagonal" is an adjective, not a noun so a pentagonal cannot exist. You can have a pentagonal plane shape, a pentagonal pyramid,a pentagonal dipyramid,a pentagonal prism and so on and each of them will look different.
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Oh honey, a pentagonal prism is like a fancy way of saying a shape with five sides and two pentagon faces. So, grab a dice and take a good look at it - that bad boy is a pentagonal prism in disguise. Or, if you're feeling extra fancy, check out a house of cards - those suckers are pentagonal prisms stacked up real nice.
A pentagonal what? A pentagonal pyramid or pentagonal prism have different numbers of vertices.
tat the pentagonal pyramid has a point at the top and the pentagonal prism is flat with out a point.
A pentagonal is not a shape. You an have a pentagonal pyramid, a pentagonal prism or a pentagonal polyhedron as well as other shapes - each would give a different set of answers.
No, a pentagonal is an adjective, not a noun. So it is not any thing - just a description of some thing. The question is like asking if "smooth" is a pyramid.