Compute the area of the polygon of the United States:

Compute the area of the latitude-longitude rectangle enclosing the United States:

Compute the area of a geo disk centered at your geo location:

Compute the area of a polygonal region on Earth, assuming geodesic edges:

Compute the area of the region enclosed by the polygon of a geo entity:

That can also be expressed as follows:

Areas of the entities of a class, in this case the countries of South America:

Total area of the polygon enclosing those countries:

Surface area of the Earth:

Area of 2D geo primitives:

Area of a region with holes:

It can also be obtained by subtracting the areas of the inner regions from that of the outer region:

Total area of a group of non-overlapping geo regions:

It can also be obtained by computing the respective areas and adding them:

The ratio of area to squared radius decreases, due to the curvature of the Earth:

GeoArea computes area on the surface of the ellipsoidal Earth:

Use Area with the projected polygon to compute area on the flat map:

"UTMZone33" is an appropriate transverse Mercator projection for Austria, and produces a relative error smaller than :

Using an inconvenient projection, like "UTMZone48", may result in large area errors:

GeoArea returns Missing["NotAvailable"] for those entity objects with no polygon information:

Missing expressions are propagated: