A tetrahedron (triangular pyramid).
A pyramid has a based that is a polygon such as a triangle or rectangle. The other sides of a pyramid consist of triangles, which are usually the same size.
A triangle based pyramid.
A pyramid can have 4 or more faces. A pyramid, with a n-sided polygon as base will have n+1 faces. The polygon with the least number of sides is a triangle and a triangular pyramid (tetrahedron) has 4 faces. A square based pyramid has 5 faces, and so on.
Rectangular-based pyramid
4
Six
A TRIANGLE based PYRAMID is called a tetrahedron.
No. A 3D triangle would be a triangular based pyramid.
a triangular based pyramid
a triangle- based pyramid has 4 faces
A triangle if it is a triangular based pyramid
A triangle based pyramid has 6, a square based pyramid has 8.
there base are a triangle
A tetrahedron.
four
No. A triangular pyramid describes a triangle whose base is a triangle (not just the sides which define it as a pyramid), whereas a rectangular pyramid is one whose base is a rectangle. A triangle and a rectangle are not the same (a triangle is not a rectangle, and a rectangle is not a triangle), so it would be incorrect to refer to a triangle-based pyramid as a rectangle pyramid.