Yes.
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They are solid shapes as for example a pyramid
NO!!! A triangle is a 2-dimensional shape of three sides; archaically a 'trigon'. A polyhedron is a 3-dimensional solid of many sides.
A pyramid is a four-sided, three-dimensional figure.
The triangular pyramid has.
A figure that has at least 3 faces. (ex.) cube, rectangular prism, pyramid, triangular prism and stuff like that.