A closed three-dimensional figure formed by four or more polygons that intersect only at their edges is called a polyhedron. It contains flat faces, straight edges, and sharp corners or vertices.
A rectangle is a two-dimensional shape, so it doesn't have faces in the way that three dimensional shapes have. A rectangle has four edges and four corners.
If it is a 2-dimensional figure then it is a quadrilateral. If it is a 3-dimensional figure then it is a tetrahedron.
A tetrahedron is a three-dimensional figure with four equilateral triangles. Every pyramid with a triangle as the base is a tetrahedron.
A three sided pyramid has four sides and six edges (think four sided die used in role playing games).
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 three-dimensional figure or shape, such as a tetrahedron, has four faces. These faces are equilateral triangles. A tetrahedron also has four vertices and 6 edges.
A pyramid is a four-sided, three-dimensional figure.
A three dimensional figure with polygonal faces is called a polyhedron. Specific names draw from the Latin prefixes. For example a four sided figure is a tetrahedron.
A triangular pyramid is a tetrahedron, or a solid three-dimensional figure made up of four triangular faces.
A closed three-dimensional figure formed by four or more polygons that intersect only at their edges is called a polyhedron. It contains flat faces, straight edges, and sharp corners or vertices.
A pyramid is a three-dimensional figure with five verticies and five sides (four of which are triangles and one of which is a square). A pentagon is a two-dimensional figure with five angles and five edges.
A tetrahedron is a polyhedron with four triangular faces, six edges, and four vertices. It is a three-dimensional shape formed by connecting four equilateral triangles at their edges, resembling a pyramid with a triangular base.
A three dimensional rhombus has four vertices and one face. The four vertices are of equal length, and oppose each other.
A tetrahedron, also called a pyramid is a three-dimensional shape with four faces.
2 dimensional (plane) figures can have three or more straight edges as sides. 3 dimensional (solid) figures can have four or more plane sides (faces). They can have fewer sides if the sides are not straight.
A Tetrahedron is a convex polyhedron that has four faces. According to Wikipedia the tetrahedron is a three dimensional triangular pyramid of four faces.