Question

George wants to build a fence around his square backyard measures 60 feet. If it cost $7 per foot for the fence and george only needs to put fencing around three sides of the yard, how much will it cost him to build the fence?

Answer 1

A = s2 (Area of a square is its side squared)
P = 4s (perimeter of a square is a side times 4)
A = 324 (the area of this square is 324 ft2)
fencing = $7 per foot
Let's find the side through the area. Find the root:
√324 = √s2
18 = s
Now the perimeter:
P = 4 * 18 = 72
Now to find how much the fencing will cost:
72 * 7 = 504