Answer:
He would need a total of 46 yards of lights.
Explanation:
If he wants to put lights around the edge of his yard he would have to find the permitted which is adding up all the measurements of the sides.
So since one side of his deck is 43 the side directly across from it is 43 and same with 26 so you would add up
43+43+26+26=138 feet
Also, there is 3 feet in one yard then you would divide 138/3 to get 46 yards