Answer:
45.0986839826 (You can round it)
Explanation:
Since there are lines showing that 3 of these sides are the same, we add 3.1 + 3.1 + 31. We also see that we need the heigh to figure out the slant side. The height would be 6.2 because I added 3.1 and 3.1. Now we can figure out the slant by using the Pythagorean Theorem. The slant would be 3.79868398264. Now we add all of the perimeter together. 12 + 20 + 3.1 +3.1 +3.1 + 3.79868398264. This equals 45.0986839826 (of course you can always round it).