Johnson's Theorem
Let three equal Circles with centers 
, 
, and 
intersect in a single point 
and intersectpairwise in the points 
, 
, and 
. Then the Circumcircle 
of 
(the so-called JohnsonCircle) is congruent to the original three.
References
Emch, A. ``Remarks on the Foregoing Circle Theorem.'' Amer. Math. Monthly 23, 162-164, 1916. Honsberger, R. Mathematical Gems II. Washington, DC: Math. Assoc. Amer., pp. 18-21, 1976. Johnson, R. ``A Circle Theorem.'' Amer. Math. Monthly 23, 161-162, 1916.
- Great Rhombidodecahedron
- Great Rhombihexacron
- Great Rhombihexahedron
- Great Snub Dodecicosidodecahedron
- Great Snub Icosidodecahedron
- Great Sphere
- Great Stellapentakis Dodecahedron
- Great Stellated Dodecahedron
- Great Stellated Triacontahedron
- Great Stellated Truncated Dodecahedron
- Great Triakis Icosahedron
- Great Triakis Octahedron
- Great Triambic Icosahedron
- Great Truncated Cuboctahedron
- Great Truncated Icosahedron
- Great Truncated Icosidodecahedron
- Grebe Point
- Greedy Algorithm
- Greek Cross
- Greek Problems
- Greene's Method
- Green's Function
- Green's Function--Helmholtz Differential Equation
- Green's Function--Poisson's Equation
- Green's Identities