Read the dictionary definition of triangle. All definitions for this word.
1. a percussion instrument consisting of a metal bar bent in the shape of an open triangle
2. any of various triangular drafting instruments used to draw straight lines at specified angles
3. a small northern constellation near Perseus between Andromeda and Aries
4. a three-sided polygon
5. something approximating the shape of a triangle
1. the coastline of Chile and Argentina and Brazil forms two legs of a triangle