[{"Bold_text": "noun", "List Items": ["a closed plane figure having three sides and three angles.", "a flat triangular , usually of plastic, with straight edges, used in connection with a T square for drawing perpendicular lines, geometric figures, etc.", "any three-cornered or three-sided figure, object, or piece:a triangle of land.", "a musical percussion instrument that consists of a steel triangle, open at one corner, that is struck with a steel rod.", "a group of three; triad .", "a situation involving three persons, especially one in which two of them are in love with the third.", "Triangle,Astronomy.the constellation Triangulum."]}]