Arancher has a rectangular 40 acre piece of property fronting a highway. he wants to put a barbed-wire fence along his road frontage. how much fence does he need if his property depth is 1,200’?

An acre is a surface measure, used in agriculture in several countries.
 According to the country and the time, it is equivalent to several surfaces.
 We will use the following conversion:
 1 acre = 43560 feet ^ 2
 Thus:
 40 acre = 1,742,400 feet ^ 2
 The area of the rectangle is:
 1,742,400 = (1,200) * (x)
 Clearing the other dimension we have:
 x = (1742400) / (1200)
 x = 1452 feet
 
 He needs 1452 feet of fence.