Matching Pairs Types of TrianglesOnline version Match the triangles to their description. by Christine Thiessen 1 Obtuse Angle 2 Isosceles triangles 3 Equilateral triangles 4 Acute Triangles. 5 Right Triangle 6 Scalene triangles This triangle has at least two equal sides. A triangle that has no equal sides. Three angles that each measure less than 90 degrees. A triangle that has three equal sides. One angle measures more than 90 degrees. One angle measures exactly 90 degrees.