1. three-sided geometric shapes with three angles
2. musical percussion instruments consisting of metal bars bent into triangular shapes
3. three-person romantic or emotional relationships involving complex dynamics

Examples

• The students learned to calculate the area of triangles in geometry class.
• She drew several triangles on the whiteboard to demonstrate the theorem.
• The orchestra’s triangles added a bright, metallic sound to the symphony.
• He played the triangle during the school band performance.
• The novel explored the complicated emotions within romantic triangles.
• Love triangles often create tension in television dramas.
• The architect incorporated triangular shapes into the building’s design.