A Triangular Pyramid has 4 triangles and 1 square.
0.5
Fuor toothpicks from 16 leave 12 which, by coincidence (?) is exactly enough for four equilateral triangles!
rectangle
A rhombus (4 congruent sides, diagonals perpendicular)that is not also a square (no right angles), andis also a parallelogram (opposite sides parallel and congruent, opposite angles congruent). It is also a quadrilateral, which has 4 sides.
square based pyramid
The three-dimensional shape consisting of 4 triangles is called a pyramid, or a triangular prism.
Square pyramid
No. For example the triangles with sides {3, 4, 5} and {6, 8, 10} are similar but not congruent.
A Triangular Pyramid has 4 triangles and 1 square.
The simplest such shape is PYRAMID.
Tetrahedron or Triangular Pyramid
A tetrahedron (triangular pyramid).
There is no 3D shape with 6 faces: 4 rectangles and 2 triangles. See the link for all forms of hexahedra.
A cube, rectangular prism, or pyramid.
You are a triangular based pyramid (tetahedron) with 4 faces, 6 edges and 4 vertices.
A three-sided pyramid, also termed a triangular prism.