Such a figure is a pyramid.
a cube
It is a TETRAHEDRON . Incorrectly named a triagular pyramid.
Pyramid
pyramid
a polygonal prism or a polygond
3-dimensional shapes made by extruding a polygon are called prisms.In this instance it would be a triangular prism.
a cube
octagonal prism (i guessed)
A Cube is NOT a polygon. A cube is a polyhedron;. A polygon is a 2-dimensional figure of many sides A polyhedron is a 3-dimensional object of many faces. A Cube is an ' Hexahedron' , meaning a solid figure of 6(hexa) faces.
It is a TETRAHEDRON . Incorrectly named a triagular pyramid.
Pyramid
A pyramid.
A polygonal pyramid.
pyramid
pyramid
a polygonal prism or a polygond
pyramid