A square pyramid fits this description, because its base is a square (a 4-sided polygon, or 4-gon), with four more sides that are triangles. (Note that triangles are also polygons, just with three sides.)
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a cube
Such a figure is a pyramid.
If I am correct I'm sure any pyramid does now if you knew what shape the base is or how many triangle faces I could answer
Yes it is. It's faces are different polygon shapes such as square, triangle, etc.... To see images and builds of polyhedrons go to this site: korthalsaltes.com
Pyramid
a cube
Such a figure is a pyramid.
octagonal prism (i guessed)
If I am correct I'm sure any pyramid does now if you knew what shape the base is or how many triangle faces I could answer
Yes it is. It's faces are different polygon shapes such as square, triangle, etc.... To see images and builds of polyhedrons go to this site: korthalsaltes.com
A pyramid.
Pyramid
a pyramid
A polygonal pyramid.
pyramid
pyramid
triangle based pyramids