1. scalene
   1. ANGLES
      1. different
         1. 3
   2. SIDES
      1. different
         1. 3
2. isosceles
   1. ANGLES
      1. equal
         1. 2
   2. SIDES
      1. equal
         1. 2
3. right-angled
   1. ANGLES
      1. 90°
         1. 1
   2. SIDES
      1. length
         1. any
4. equilateral
   1. ANGLES
      1. equal
         1. 3
   2. SIDES
      1. equal
         1. 3