Napoleon Triangles
The inner Napoleon triangle is the Triangle 
formed by the centers of internally erectedEquilateral Triangles 
, 
, and 
on the sidesof a given Triangle 
. It is an Equilateral Triangle.
The outer Napoleon triangle is the Triangle 
formed by the centers of externally erectedEquilateral Triangles 
, 
, and 
on thesides of a given Triangle . It is also an Equilateral Triangle.
References
Coxeter, H. S. M. and Greitzer, S. L. Geometry Revisited. Washington, DC: Math. Assoc. Amer., pp. 60-65, 1967.
- Great Dirhombicosidodecahedron
- Great Disdyakis Dodecahedron
- Great Disdyakis Triacontahedron
- Great Ditrigonal Dodecacronic Hexecontahedron
- Great Ditrigonal Dodecicosidodecahedron
- Great Ditrigonal Icosidodecahedron
- Great Dodecacronic Hexecontahedron
- Great Dodecadodecahedron
- Great Dodecahedron
- Great Dodecahedron-Small Stellated Dodecahedron Compound
- Great Dodecahemicosacron
- Great Dodecahemicosahedron
- Great Dodecahemidodecacron
- Great Dodecahemidodecahedron
- Great Dodecicosacron
- Great Dodecicosahedron
- Great Dodecicosidodecahedron
- Greater
- Greater Than/Less Than Symbol
- Greatest Common Denominator
- Greatest Common Divisor
- Greatest Common Divisor Theorem
- Greatest Common Factor
- Greatest Integer Function
- Greatest Lower Bound