Answer:
18 units
Explanation:
We can find the distance between each pair of consecutive points, and then add up those distances to find the perimeter of the polygon:
AB = 1 unit
BC = 5 units
CD = 1 unit
DA = 5 units
AC = 5 units
BD = 1 unit
Therefore, the perimeter of the polygon is:
AB + BC + CD + DA + AC + BD
= 1 + 5 + 1 + 5 + 5 + 1
= 18 units
So the perimeter of the polygon formed by the given points is 18 units.