Relacionar Columnas PROPERTIES OF THE TRIANGLEVersión en línea PROPERTIES OF THE TRIANGLE por Alfonso Estrada Padilla Oficial 1 What is the sum of angles property of a triangle called? 2 Any exterior angle of a triangle is equal to the sum of its interior opposite angles 3 A triangle that has three sides of the same length. 4 A triangle that has two sides of the same length and the third side of different length. 5 A triangle that has three sides of different lengths. 6 What is the name given to a triangle whose three angles are less than 90°? This is called the exterior angle property of a triangle. Acute-angled triangle. A scalene triangle. The sum of all internal angles of a triangle is always equal to 180° Equilateral triangle. Isosceles triangle.