Area = ----
I1 + I2
Area =______ = h
(I1 and I2 must be parallel)
(3) Areas more complicated than previously shown can be broken down
into smaller areas (see below) or, if they are quite complex, it may be necessary to have
their areas computed by a professional surveyor.
Triangle and trapezoid
Figure broken into a
triangle and a trapezoid.
b. Areas in Acres. An acre contains 43,560 square feet. Therefore, once an
area is determined in square feet, it may be divided by 43,560 to obtain its area in
acres. For example, a field 400 feet long and 400 feet wide contains 160,000 square
feet (400 X 400 = 160,000). 160,000 square feet divided by 43,560 square feet per acre
is equal to about 3.67 acres.