It could be a square based pyramid
It is square because when you add it up then you subract and add triangle then you calulate the sides and get triangle
A square triangle
No because it is flat 2d shape with 4 equal sides
a cube
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 Square Pyramid.
it is a plane shape because you said its a square
no
a pyramid, in the sense that most people think of has a square base, with 4 triangle 'sides', which would be 5 faces. A regular tetrahedron has 4 equilateral triangles as faces.
i think it would be a triangle, because usually it has 3 sides. so my opinion is that it is a triangle. Or maybe a square.. because it would be a equilateral triangle.
Triangle
A prism is defined as a solid (or three dimensional) geometrical shape in which the sides are parallel, whereas in a pyramid the sides are not parallel and they all come together in an apex.