A three-sided polygon with three angles. The children learned how to calculate the area of a triangle in math class.
A musical instrument made of a steel rod bent into a triangular shape, played by striking with a metal beater. The musician added a gentle chime to the song by playing the triangle.
A situation involving three people or things, especially an emotional relationship involving a love triangle. The movie's plot revolves around a complicated love triangle.
A triangular frame used in cue sports such as billiards or pool to arrange the balls at the beginning of a game. He racked the balls tightly in the triangle before taking the break shot.