hexadecagon
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A pyramid with an n-sided base will have n + 1 vertices, n + 1 faces, and 2n edges. 9, 9 and 16
There are many possible answers: The simpler ones among these are: pyramid with a 15 sided polygon as base. dipyramid with a 14 sides polygon as base. prism with octagonal bases.
A 16-sided figure is known as a hexakaidecagon, 16(sixteen)-gon, or hexadecagon.
16. The base has eight around it and there are eight more connecting the vertices of the base to the apex of the pyramid.
You did not give the height of the pyramid and 16 cm is not an area, but the area of the face would be one half the face height of the side of the pyramid times the length of the base side.