triangle

basic three-sided shape of geometry
Thing geometric_shape Q19821
triangle
Amit6 · Public Domain · Wikimedia
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Summary

triangle is a geometric shape[1]. triangle ranks in the top 10% of geometric shape entities by monthly Wikipedia readership (23,264 views/month).[2]

Key Facts

  • Follows: digon[3], line segment[4]
  • Followed by: quadrilateral[5], tetrahedron[6]
  • Subclass of: bicentric polygon[7], simplex[8], tritope[9], polygon[10], planar generalized triangle[11]
  • Commons category: Triangles[12]
  • Unicode character: 🔺[13], 🔻[14]
  • Topic's main category: Category:Triangles[15]
  • Has facet polytope: edge[16]
  • Described by source: Brockhaus and Efron Encyclopedic Dictionary[17], Small Brockhaus and Efron Encyclopedic Dictionary[18], Encyclopædia Britannica 11th edition[19]
  • Topic has template: Q25744722[20]
  • Has characteristic: plane area[21], perimeter[22], triangle inequality theorem[23], area of a triangle[24]
  • Has vertex figure: line segment[25]
  • Different from: equilateral triangle[26], scalene triangle[27], isosceles triangle[28]
  • Has part(s) of the class: edge[29], vertex[30], base[31], height[32], apex[33], apex-base pair[34]
  • Union of: list of values as qualifiers[35]
  • Disjoint union of: list of values as qualifiers[36]
  • On focus list of Wikimedia project: Wikipedia:Vital articles/Level/4[37]
  • Wikimedia outline: list of triangle topics[38]
  • Maintained by WikiProject: WikiProject Mathematics[39]

Body

Influence

Things named for triangle include triangular theory of love[40], a psychological theory[41]; Triangulum[42], a constellation[43]; Triangulum Australe[44], a constellation[45]; triangle-free graph[46], a class of the graphs without certain subgraphs[47]; Triangle[48], a film[49], directed by Henrik Malyan[50]; and triangle button[51], a PlayStation game controller button[52].

Why It Matters

triangle has Wikipedia articles in 30 language editions, a strong signal of global cultural recognition.[53] triangle is known by 84 alternative names across languages and contexts.[54]

Entities named for triangle include triangular theory of love[40], a psychological theory[41]; Triangulum[42], a constellation[43]; Triangulum Australe[44], a constellation[45]; triangle-free graph[46], a class of the graphs without certain subgraphs[47]; Triangle[48], a film[49], directed by Henrik Malyan[50]; and triangle button[51], a PlayStation game controller button[52].

References

Programmatic citations — every numbered marker resolves to a verifiable graph row below.

Direct Wikidata claims

  1. [3] ↑ . wikidata.org.
  2. [4] ↑ . wikidata.org.
  3. [5] ↑ . wikidata.org.
  4. [6] ↑ . wikidata.org.
  5. [7] ↑ . wikidata.org.
  6. [8] ↑ . wikidata.org.
  7. [9] ↑ . wikidata.org.
  8. [10] ↑ . wikidata.org.
  9. [11] ↑ . wikidata.org.
  10. [12] ↑ . wikidata.org.
  11. [13] ↑ . wikidata.org.
  12. [14] ↑ . wikidata.org.
  13. [15] ↑ . wikidata.org.
  14. [16] ↑ . wikidata.org.
  15. [17] ↑ . wikidata.org.
  16. [18] ↑ . wikidata.org.
  17. [19] ↑ . wikidata.org.
  18. [20] ↑ . wikidata.org.
  19. [21] ↑ . wikidata.org.
  20. [22] ↑ . wikidata.org.
  21. [23] ↑ . wikidata.org.
  22. [24] ↑ . wikidata.org.
  23. [25] ↑ . wikidata.org.
  24. [26] ↑ . wikidata.org.
  25. [27] ↑ . wikidata.org.
  26. [28] ↑ . wikidata.org.
  27. [29] ↑ . wikidata.org.
  28. [30] ↑ . wikidata.org.
  29. [31] ↑ . wikidata.org.
  30. [32] ↑ . wikidata.org.
  31. [33] ↑ . wikidata.org.
  32. [34] ↑ . wikidata.org.
  33. [35] ↑ . wikidata.org.
  34. [36] ↑ . wikidata.org.
  35. [37] ↑ . wikidata.org.
  36. [38] ↑ . wikidata.org.
  37. [39] ↑ . wikidata.org.

Inverse relationships (entities pointing at this one)

  1. [40] ↑ . wikidata.org. → on this site
  2. [42] ↑ . wikidata.org. → on this site
  3. [44] ↑ . wikidata.org. → on this site
  4. [46] ↑ . wikidata.org. → on this site
  5. [48] ↑ . wikidata.org. → on this site
  6. [51] ↑ . wikidata.org. → on this site

Inline context (facts about related entities)

  1. [41] ↑ . Wikidata. wikidata.org. → on this site
  2. [43] ↑ . Wikidata. wikidata.org. → on this site
  3. [45] ↑ . Wikidata. wikidata.org. → on this site
  4. [47] ↑ . Wikidata. wikidata.org. → on this site
  5. [49] ↑ . Wikidata. wikidata.org. → on this site
  6. [50] ↑ . Wikidata. wikidata.org. → on this site
  7. [52] ↑ . Wikidata. wikidata.org. → on this site

Class ancestry

  1. [1] ↑ . Wikidata. wikidata.org.

Aggregate / graph-position facts

  1. [2] ↑ . Wikimedia Foundation. dumps.wikimedia.org.
  2. [53] ↑ . Wikidata sitelinks. wikidata.org.
  3. [54] ↑ . Wikidata aliases. wikidata.org.

📑 Cite this page

Use these citations when quoting this entity in research, articles, AI prompts, or wherever provenance matters. We aggregate Wikidata + Wikipedia + authoritative open-data sources; the stitched, scored, cross-referenced view is what 4ort.xyz contributes.

APA 4ort.xyz Knowledge Graph. (2026). triangle. Retrieved October 14, 2026, from https://4ort.xyz/entity/triangle-q19821-2
MLA “triangle.” 4ort.xyz Knowledge Graph, 4ort.xyz, 14 Oct. 2026, https://4ort.xyz/entity/triangle-q19821-2.
BibTeX @misc{4ortxyz_triangle-q19821-2_2026, author = {{4ort.xyz Knowledge Graph}}, title = {{triangle}}, year = {2026}, url = {https://4ort.xyz/entity/triangle-q19821-2}, note = {Accessed: 2026-10-14}}
LLM prompt According to 4ort.xyz Knowledge Graph (aggregator of Wikidata, Wikipedia, and authoritative open-data sources): triangle — https://4ort.xyz/entity/triangle-q19821-2 (retrieved 2026-10-14)

Canonical URL: https://4ort.xyz/entity/triangle-q19821-2 · Last refreshed:

Edit History

Rolling log of changes to this entity's Wikidata record. Values shown reflect the current state of each edited property — follow the history link to see the precise diff for any edit.

  1. 7w ago · عُثمان · 2026-08-23 view diff on Wikidata ↗
    Pronunciation audio → LL-Q1571 (mar)-Vj18081991-त्रिकोण.wav
    P14439 → 000520
    "/* wbsetclaim-create:2||1 */ P14439: 000520"
  2. 11w ago · Pierrotrgr · 2026-07-24 view diff on Wikidata ↗
    Biblissima authority id → Q320050
    "/* wbsetclaim-create:2||1 */ Biblissima authority id: Q320050, Import ID Biblissima V3 ([[:toollabs:editgroups/b/OR/a6710164cdc|details]])"
  3. 17w ago · Jindřich Rubeš · 2026-06-11 view diff on Wikidata ↗
    Svkkl authority id → 0454561-trojuhelniky
    "/* wbcreateclaim-create:1| */ Svkkl authority id: 0454561-trojuhelniky, [[:toollabs:quickstatements/#/batch/259494|batch #259494]]"
  4. 20w ago · Twofivesixbot bot · 2026-05-23 view diff on Wikidata ↗
    Follows → digon, line segment
    Union of → list of values as qualifiers
    Wikimedia outline → list of triangle topics
    Subclass of → —
    + 20 other properties edited (see Wikidata diff for full list)
    "/* wbsetclaim-update-qualifiers:1||1|3 */ National library of israel j9u id: 987007548775205171, mv to monolingual text names on J9U statements"
Live feed via Wikidata EventStreams. New edits appear within minutes of being made on Wikidata.