1. Each segment is the hypotenuse of a 3-4-5 right triangle, so is length 5. The four segments lengths add to 20 units (B).
2. Half the perimeter is 9.47, so the perimeter rounded to the nearest unit will be 19 units (C).
The sides parallel to the x-axis are 5 units long. The slanted sides have a rise of 4 for a run of 2, so are √(2^2 +4^2) = √20 ≈ 4.47 units long. Then the perimeter is 2(5 +4.47) = 18.94 ≈ 19.