Answer
A = 0.81 km$^{2}$
P = 3.6 km
Work Step by Step
Perimeter = P
P = 4$s$
P = 4 * 0.9 km
P = 3.6 km
Area = A
A = s$^{2}$
A = 0.9 km$^{2}$
A = 0.81 km$^{2}$
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