Category:Triangle geometry

O

• Objects defined for a triangle (3 C, 9 P)

P

• Parts of a triangle (4 P)

T

• Theorems about triangles (3 C, 29 P)
• Triangle problems (6 P)
• Triangulation (geometry) (27 P)
• Trigonometry (6 C, 101 P)
• Types of triangles (21 P)

• List of triangle topics

0–9

• 5-Con triangles

A

• AA postulate
• Ailles rectangle

B

• Barycentric coordinate system
• Bernoulli quadrisection problem

C

• Catalogue of Triangle Cubics
• Circumcevian triangle
• Circumgon
• Congruent number
• Conway triangle notation

E

• Eisenstein triple

F

• Feuerbach hyperbola

H

• Hart circle

I

• Isogonal conjugate
• Isotomic conjugate

J

• Johnson circles

K

• Kiepert conics

M

• Marching triangles
• Mass point geometry
• McCay cubic
• Modern triangle geometry

N

• Neuberg cubic

O

• Orthocentric system
• Orthologic triangles
• Orthotransversal

P

• Perspective (geometry)

S

• The Secrets of Triangles
• Semiperimeter
• Similarity (geometry)
• Sine-triple-angle circle
• Soddy line
• Sum of angles of a triangle
• Surface triangulation

T

• Triangle conic
• Triangle strip
• Triangular coordinates
• Trilinear coordinates
• Trilinear polarity