Question

one side of an equilateral triangle is 4 cm find its area using heron formula

Answer 1

s= 3a / 2
  = 3*4/2
 = 12/2 = 6cm


a=√6(6-4)(6-4)(6-4)
  = √6*2*2*2
  = √3*2*2*2*2
  = 2*2√3
  = 4√3 cm