polyhedrons have flat sides. (I can't get pics on here I tried)
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NO!!! A triangle is a 2-dimensional shape of three sides; archaically a 'trigon'. A polyhedron is a 3-dimensional solid of many sides.
An apex is the point at the top of a polyhedron where all the sides meet. example: the top of a pyramid.
False
False
It is a face of the polyhedron