Question

1. what is the area

Explanation:

Step1: Identify the shape and formula

The shape is a square. The area formula for a square is $A = s^2$, where $s$ is the side - length.

Step2: Substitute the side - length value

Given $s = 18$ mi, we substitute it into the formula: $A=(18)^2$.

Step3: Calculate the area

$(18)^2=18\times18 = 324$ square miles.

Answer:

324 square miles