## Basic College Mathematics (10th Edition)

A = 0.81 km$^{2}$ P = 3.6 km
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$^{2}$