Question 204327
A = [(a^2)/4]sqrt(3)

153 = [(a^2)/4]sqrt(3)
153/sqrt(3) = (a^2)/4
4[153/sqrt(3)] = a^2
sqrt{4[153/sqrt(3)]}=a

Perimeter is just three sides adding together; and since all the sides are the same we can take one side times 3

3sqrt{4[153/sqrt(3)]} = P = 56.392 cm