First, let's find each length of the city
To do that, find the square root of 900
l² = 900
l= 30 miles
The length of the city is 30 miles
We need to find the length on map
1 inch = 20 miles
x = 30 miles
20 x = 30
x=1.5 miles
The length is 1.5 miles on map
Hence the area on map is ;
Area = l² = 1.5² = 2.25
Hence the city area is 2.25 square inches
