## Basic College Mathematics (9th Edition)

The area of the land that can't be built on equals 6528 ft$^{2}$
To find the area of the land that cannot be built on we simply subtract the area of the smaller rectangle from the area of the larger rectangle. Area of a rectangle: $A$ = $l$$w A$$_{can't}$ = $A$$_{large} - A$$_{small}$ $A$$_{large} = (172 ft)(124 ft) A$$_{large}$ = 21328 ft$^{2}$ $A$$_{small} = (148 ft)(100 ft) A$$_{small}$ = 14800 ft$^{2}$ $A$$_{can't} = 21328 ft^{2} - 14800 ft^{2} A$$_{can't}$ = 6528 ft$^{2}$