Category:Triangles
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This category contains results about Triangles in the context of Geometry.
Definitions specific to this category can be found in Definitions/Triangles.
Subcategories
This category has the following 70 subcategories, out of 70 total.
A
- Altitudes of Triangles (empty)
- Angle Bisector Theorem (2 P)
B
- Brocard Points (1 P)
C
- Ceva's Theorem (3 P)
E
- Euler Line (1 P)
- Euler Triangle Formula (9 P)
- Exradii of Triangles (empty)
F
- Fermat Problem (3 P)
- Fermat-Torricelli Point (empty)
- Feuerbach Circles (3 P)
- Fleenor-Heronian Triangles (1 P)
- Fontené Theorems (9 P)
H
I
- Isogonal Conjugates (empty)
L
- Law of Cosines (13 P)
- Law of Sines (9 P)
- Law of Tangents (7 P)
- Length of Angle Bisector (4 P)
M
- Medial Triangles (4 P)
- Menelaus's Theorem (3 P)
- Midline Theorem (4 P)
- Morley's Trisector Theorem (4 P)
N
- Napoleon's Theorem (6 P)
- Nine Point Circle Theorem (4 P)
O
- Oblique Triangles (empty)
P
- Parallel Transversal Theorem (3 P)
- Principal Parts of Triangle (empty)
R
S
- Scalene Triangles (2 P)
- Secondary Parts of Triangle (empty)
- Sign of Area of Triangle (empty)
- Solution of Triangle (empty)
- Steiner Inellipse (empty)
- Steiner-Lehmus Theorem (8 P)
T
W
- Wallace-Simson Line (1 P)
Pages in category "Triangles"
The following 105 pages are in this category, out of 105 total.
A
C
- Center of Mass of Uniform Triangular Lamina
- Ceva's Theorem
- Circumscribing about Circle Triangle Equiangular with Given
- Circumscribing Circle about Triangle
- Congruence of Triangles is Equivalence Relation
- Construction of Parallelogram equal to Triangle in Given Angle
- Construction of Parallelogram on Given Line equal to Triangle in Given Angle
- Construction of Triangle from Given Lengths
- Converse Hinge Theorem
- Cosine of Half Angle in Triangle
- Crossbar Theorem
E
- Equal Sized Triangles on Equal Base have Same Height
- Equal Sized Triangles on Same Base have Same Height
- Equiangular Triangles are Similar
- Equiangular Triangles are Similar/Proof 2
- Euler Triangle Formula
- Every Triangle has 2 Equal Sides
- External Angle of Triangle equals Sum of other Internal Angles
- External Angle of Triangle is Greater than Internal Opposite
G
L
- Largest Parallelogram Contained in Triangle
- Largest Rectangle Contained in Triangle
- Lateral Face of Prismatoid is Triangle, Trapezium or Parallelogram
- Law of Cosines
- Law of Sines
- Law of Tangents
- Length of Angle Bisector
- Length of Angle Bisector in terms of Angle
- Length of Circumradius of Triangle
- Length of Inradius of Triangle
- Length of Side of Triangle as Cosines of Angles
- Line Parallel to Side of Triangle which Bisects One Side also Bisects Other Side
- Lines Through Endpoints of One Side of Triangle to Point Inside Triangle is Less than Sum of Other Sides
- Lines Through Endpoints of One Side of Triangle to Point Inside Triangle is Less than Sum of Other Sides/Corollary
M
N
P
R
S
- Sides of Equiangular Triangles are Reciprocally Proportional
- Similar Figures on Sides of Right-Angled Triangle
- Similar Polygons are composed of Similar Triangles/Porism
- Simson Line Theorem
- Sine of Angle of Triangle by Semiperimeter
- Sine of Half Angle in Triangle
- Sine of Twice Angle minus Sum of Sines of Twice Other Two Angles of Triangle
- Square equals Sum of Squares implies Right Triangle
- Steiner-Lehmus Theorem
- Stewart's Theorem
- Sum of Angles of Triangle equals Two Right Angles
- Sum of Angles of Triangle in Elliptic Geometry
- Sum of Angles of Triangle in Hyperbolic Geometry
- Sum of Cosines of Angles in Triangle
- Sum of Cosines of Four Times Angles of Triangle
- Sum of Cosines of Twice 2 Angles minus Cosine of Twice Third Angle of Triangle
- Sum of Cosines of Twice Angles of Triangle
- Sum of Cotangents of Half Angles in Triangle
- Sum of Sides of Triangle in terms of Circumradius and Half Angle Cosines
- Sum of Sines of Angles in Triangle
- Sum of Sines of Twice Angles of Triangle
- Sum of Tangents of Angles in Triangle
- Sum of Two Sides of Triangle Greater than Third Side
T
- Tangent of Half Angle in Triangle
- Triangle Angle-Angle-Side Congruence
- Triangle Angle-Side-Angle and Side-Angle-Angle Congruence
- Triangle Angle-Side-Angle and Side-Angle-Angle Congruence/Proof
- Triangle Angle-Side-Angle Congruence
- Triangle Congruence
- Triangle Side-Angle-Angle Congruence
- Triangle Side-Angle-Side Congruence
- Triangle Side-Side-Side Congruence
- Triangles with One Equal Angle and Two Other Sides Proportional are Similar
- Triangles with Proportional Sides are Similar
- Triangles with Two Sides Parallel and Equal
- Two Angles of Triangle are Less than Two Right Angles
- Two Ears Theorem