Answer:
19.1 units.
Explanation:
The perimeter of a shape is the total length of all its sides.
In this case, the shape is a quadrilateral, so we need to find the lengths of all four sides and add them up.
We can use the distance formula to find the length of each side. The distance formula is:

where d is the distance between the two points, x1 and y1 an are the coordinates of the first point, and x2 and y2 are the coordinates of the second point.
Here are the lengths of each sides of the quadrilateral, calculated using the distance formula:




The perimeter of the quadrilateral is AB+BC+CD+DA
= 5.099 + 4.47 + 5.099 + 4.47 =19.13
Therefore, Perimeter of the shape is 19.1 units.