A tetrahedron
In geometry, a deltahedron (plural deltahedra) is a polyhedron whose faces are all equilateral triangles. The name is taken from the Greek upper case delta (Δ), which has the shape of an equilateral triangle.
Triangular prism
triangular prism
There are: Isoceles, Right, Scalene, and Equilateral.
A solid with 20 faces is called a icosahedron. It is one of the five Platonic solids and is characterized by its twenty equilateral triangular faces, 30 edges, and 12 vertices. The icosahedron is often used in geometry, gaming, and various applications in science and art.
a regular octahedron
square
This shape is called a Icosahedron , I think.
Isosceles TetrahedronA solid with four faces is a tetrahedron. Each of the faces is a triangle. If all the triangles are congruent, you have an isosceles tetrahedron.
Tetrahedron
1~Tetrahedron *4 faces (made of equilateral triangles) *6 edges *5 vertices 2~Hexahedron (cube) *6 faces (made of squares) *12 edges *8 vertices 3~Octrahedron *8 faces (made up of equilateral triangles) *12 edges *6 vertices 4~Icosahedron *20 faces (made of equilateral triangles) *30 edges *12 verticies 5~Dodecahedron *12 faces (made of pentagons) *30 edges *20 vertices.
In geometry, a deltahedron (plural deltahedra) is a polyhedron whose faces are all equilateral triangles. The name is taken from the Greek upper case delta (Δ), which has the shape of an equilateral triangle.
Triangular prism
triangular prism
isoceles, equilateral, and scalene...
equilateral and scalene
equilateral, isosceles and scalene.