Answer:
Area = 3.897
Explanation:
Remark
What you are subtly being told is the side of an equalateral triangle = P/n.
n = the number of sides
n = 3
P = 9
side = 9/3 = 3
The area of an equalateral triangle given 1 side is
Area = sqr(3) * s^2 /4
Area = 3.897