A tetrahedron.
A quadrilateral.
a parallelogram
It is a tetrahedron which is a triangular based pyramid
That 3D shape is called triangular pyramid.
a 4 sided 3d shape is called a triangular prism!!!!!!!!!!!!!!!
Triangular Pyramid.
A tetrahedron.
tetrahedron
A three-sided pyramid, also termed a triangular prism.
quadrangle
A quadrilateral.
Quadrilateral
Get any 4 sided shape and vary all the sides to different lenghts and make it look weird-there you go an irregular 4 sided shape.
square
square
a square