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Isosceles Triangle
  Two sides are the same length
  The two angles facing those sides are the same length

Equilateral Triangle
  All interior angles are 60
  All sides are the same length.

Right Triangle
  Contain a 90^{o} angle
  Puthagorean Theorem a^{2 }+ b^{2} = c^{2}

345 Right Triangle
sides always come in predictable ratios.
 3^{2} + 4^{2} = c^{2}
 9 + 16 = c^{2}
 25 = c^{2}
 5 = c
 12^{2} + b^{2} = 13^{2}
 144 + b^{2} = 169
 b^{2} = 25
 b = 5

Isosceles Right Triangle
 Ratio: 1 : 1 : √2
 Perimeter = 2x + x√2
 √2 = 1.4

306090 Right Triangle
 Ratio: 1 : √3 : 2
 Perimeter= x + 2x + x√3

√3 = 1.7

