triangular
https://gyazo.com/758d24ff0d297f468e8e7f3d78d997c2
source: By Tomruen at English Wikipedia - Own work, Public Domain
adjective
shaped like a triangle; having three sides and three corners:
三角の; 三角形の; 三角柱, 錐の
e.g. dainty triangular sandwiches.
involving three people or parties:
3者, 3国間の; 三つどもえの; 三角関係の
e.g. a triangular relationship.
(of a pyramid) having a three-sided base.
DERIVATIVES
triangularity | trīˌaNGɡyəˈlerədē | noun
triangularly adverb
ORIGIN
mid 16th century: from late Latin triangularis, from Latin triangulum (see triangle).