Question description

Use the figures below to
estimate the area of the center-pivot irrigation (CPI) fields in 1991, 2000,
and 2004. CPI-irrigated fields appear as green circles on the satellite images.
Each circle covers approximately 0.166 km2  (1/6 km2).  For this question, we will focus on the study
area outlined in black in each of the three images.
a. 
How
much land was irrigated in the black square in 1991?  ________km2
b. 
How
much land was irrigated in the black square in 2000?  ________km2
c. 
How
much land was irrigated in the black square in 2004?  ________km2

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