find the perimeter and the area of an equilateral triangle whose height is 12cm.

Height = 12 m
Area of equilateral triangle = √3 / 4 * a²
√3 / 4 * a² = 1/2 * b * h
We get our sides as 13.856 cm after solving this equation.
  Perimeter = 3 * 13.856 cm
                  = 41.568 cm
Area = √3 / 4 * a²
         = 11.999 cm²
          = 12 cm² (Approx.) 

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