An icosahedron.
A tetrahedron, or triangular pyramid, has four congruent equilateral triangles as its faces. Each face is an equilateral triangle, and the tetrahedron is a three-dimensional shape with four vertices and six edges. This symmetry gives the tetrahedron its unique geometric properties.
Regular polygons have congruent angles such as squares and equilateral triangles.
A four faced figure is a tetrahedron. If they are all congruent triangles, they are all equilateral triangles and it is a regular tetrahedron - one of the 5 Platonic Solids.
The shape you are describing is a regular octahedron. An octahedron has eight equilateral triangular faces, with all faces being congruent. It is one of the five Platonic solids, characterized by its symmetrical structure and equal edge lengths.
Triangular Pyramid
An Icosahedron.
This shape is called a Icosahedron , I think.
A tetrahedron, or triangular pyramid, has four congruent equilateral triangles as its faces. Each face is an equilateral triangle, and the tetrahedron is a three-dimensional shape with four vertices and six edges. This symmetry gives the tetrahedron its unique geometric properties.
Regular polygons have congruent angles such as squares and equilateral triangles.
A four faced figure is a tetrahedron. If they are all congruent triangles, they are all equilateral triangles and it is a regular tetrahedron - one of the 5 Platonic Solids.
Triangular Pyramid
Differences: Squares have 4 sides / equilateral triangles have 3 sides. Squares have 90 degree angles / equilateral triangles have 60 degree angles. Squares have 2 diagonals / equilateral triangles have none Similarities: All sides of the shape are congruent All angles of the shape are congruent
The Platonic solid known as an octahedron would fit the given description
The tetrahedron has 4 equilateral triangles as its faces.
A TETRAHEDRON. Incorrectly named as a 'triangular pyramid'.
square based pyramid
An octahedron.