Answer:
20m
Explanation:
the 4m and 2m on the right can make a rectangle for 8m, then you can make another rectangle on the left side with the remaining 4m (from the 8m side) to make 8m so now were at 16, the triangle remainse, the length is 4m and the height is 2m making 8/2 or 4
16+4 = 20m
- Gage Millar, Algebra 2 tutor