We can use the distance formula on all three points to find the perimeter.
[tex]\sqrt{(x.2 - x.1)^{2} + (y.2 - y.1)^{2}}[/tex]
We can plug in the values for each of the coordinates to find each distance.
√(4 - (-4))^2 + (5 - (-1))^2 = 10
√(4 - 4)^2 + (-2 - 5)^2 = 7
√(4 - (-4))^2 + (-2 - (-1))^2 = 8.1
8.1 + 7 + 10 = 25.1
Your answer is 25.1
