A pyramid with a square base.
pyramid
There is a contradiction in your question. If the base has four equal sides then is it a square so not all the faces are Triangles. However if the base is a square and the rest of the faces are triangles then your object is a "Square-based Pyramid"
A pyramid
A square based pyramid would comply with the given dimensions.
A pyramid with a square base.
pyramid
A hexagonal pyramid.
There is a contradiction in your question. If the base has four equal sides then is it a square so not all the faces are Triangles. However if the base is a square and the rest of the faces are triangles then your object is a "Square-based Pyramid"
The figure is a pyramid and the base is a square.
A three dimensional triangular figure with three faces and a base is called a triangular pyramid. It has four vertices, four faces, and six edges.
A pyramid.
A pyramid
Tetrahedron has three sides and a base all triangular.
Square Pyramid
A square based pyramid would comply with the given dimensions.
A pyramid with a square base is called a square pyramid. It is a three-dimensional shape that has a square as its base and four triangular faces that meet at a point called the apex.