Length(L) = 9 meters
Width (W)=6 meters
To calculate how many meters of fence he will need, we have to calculate the perimeter of the rectangle:
perimeter of a rectangle (P) = 2L+2W
Replacing with the values given:
P= 2(9)+2(6)=18+12= 30 meters of fence
The grass needed to cover the entire area can be calculated by calculating the area of the rectangle:
Area of a rectangle (A)= W x L
A = 6 x9 = 54 square meters of grass