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A pyramid with a quadrilateral base. * * * * * A triangular dipyramid or a quadrilateral based pyramid.
A quadrilateral based pyramid.
In geometry, pyramid has many forms such as rectangular pyramid, trapezoidal pyramid, quadrilateral pyramid and even triangular pyramid. Triangular pyramid is a pyramid with triangular base and can be called as a tetrahedron if each of its faces has congruent equilateral triangles.
A pyramid with a quadrilateral base.
A quadrilateral based pyramid.