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Triangles
edit- AA postulate
- Altitude (triangle)
- Angle bisector theorem
- Apollonius' theorem
- Barrow's inequality
- Base (geometry)
- CPCTC
- Carnot's theorem
- Centroid
- Ceva's theorem
- Congruent number
- Conway triangle notation
- Encyclopedia of Triangle Centers
- Erdős–Mordell inequality
- Euler line
- Euler's theorem in geometry
- Exterior angle theorem
- Extouch triangle
- Fermat point
- GEOS circle
- Hadwiger–Finsler inequality
- Heron's formula
- Hinge theorem
- Incircle and excircles of a triangle
- Inertia tensor of triangle
- Isodynamic point
- Isogonal conjugate
- Johnson circles
- Law of cosines
- Law of sines
- Lester's theorem
- List of triangle topics
- Marching triangles
- Mass point geometry
- Medial triangle
- Menelaus' theorem
- Morley's trisector theorem
- Nagel point
- Napoleon's theorem
- Nine-point circle
- Nine-point hyperbola
- One-seventh area triangle
- Ono's inequality
- Orthocentric system
- Pedal triangle
- Pedoe's inequality
- Pompeiu's theorem
- Pythagorean triple
- Right triangle
- Routh's theorem
- SSS postulate
- Saccheri–Legendre theorem
- Schiffler point
- Semiperimeter
- Simson line
- Spieker circle
- Splitter (geometry)
- Steiner–Lehmus theorem
- Stewart's theorem
- Symmedian
- Thales' theorem
- Triangle
- Triangle center
- Triangular coordinates
- Trilinear coordinates
- Viviani's theorem
- Weitzenböck's inequality
- Integer triangle
- Barycentric coordinate system (mathematics)
- Brocard triangle
- Brocard circle
- Brocard points
- Cathetus
- Circumscribed circle
- Cleaver (geometry)
- Congruence (geometry)
- Constrained Delaunay triangulation
- De Longchamps point
- Delaunay triangulation
- Dragon's Eye (symbol)
- Equilateral triangle
- Fuhrmann circle
- Golden triangle (mathematics)
- User:Extcetc/Hadley's Theorem
- Heronian triangle
- Hypotenuse
- Isotomic conjugate
- Isotomic lines
- Kepler triangle
- Kobon triangle problem
- Mandart inellipse
- Marden's theorem
- Median (geometry)
- Mittenpunkt
- Mollweide's formula
- Perspective (geometry)
- User:CBM/Sandbox3
- Pythagorean theorem
- Regiomontanus' angle maximization problem
- Sierpinski triangle
- Similarity (geometry)
- Solution of triangles
- Special right triangles
- Steiner inellipse
- Tarry point
- Triangular number
- Trisected perimeter point
- Valknut