Find the length of the side using the distance formula
Length = sqrt((x2-x1)^2 + (y2-y1)^2)
Length = sqrt((2- -1)^2 + (3-4)^2
Length = sqrt(10)
The length of the side is sqrt(10)
A pentagon has 5 equal sides. Multiply the length of the side by 5
Answer: 5sqrt(10)