The Flatiron Building is in the shape of triangle.

Building is bounded by 22nd Street, Broadway and 5th Avenue.

Measurements along 22nd Street, Broadway and 5th Avenue are sides of the building.

Measurement along 22nd Street is .

Measurement along Broadway is .

Measurement along 5th Avenue is ft.

Apply Herons area formula: , where .

.

Area of the Flatiron Building is .

Area of the Flatiron Building is .