die Gesamtfläche
total area
The sum of all partial areas of an object, a room, or a region. It refers to the entire extent of a surface.
Die Gesamtfläche der Wohnung beträgt 80 Quadratmeter.
The total area of the apartment is 80 square meters.

total area
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total area
The sum of all partial areas of an object, a room, or a region. It refers to the entire extent of a surface.
Die Gesamtfläche der Wohnung beträgt 80 Quadratmeter.
The total area of the apartment is 80 square meters.

The word is made up of 'gesamt' (total, whole) and 'Fläche' (area, surface). So it literally means the entire area of something.
Die Gesamtfläche des Grundstücks ist für den Bau eines Hauses ausreichend.
The total area of the plot is sufficient for building a house.
'Gesamtfläche' (total area) is often used with the verb 'betragen' (to amount to / to be) and a unit of measurement such as 'Quadratmeter' (square meters, m²). You often find it in real estate listings or in technical descriptions.
Die zu vermietende Gesamtfläche beträgt 120 Quadratmeter.
The total area available for rent is 120 square meters.
This word belongs more to written language or to formal and technical contexts. It is used, for example, in contracts, building plans, or scientific texts.
Im Mietvertrag ist die exakte Gesamtfläche der Büroräume festgehalten.
The exact total area of the office spaces is recorded in the rental contract.
area / surface
'die Fläche' and 'die Gesamtfläche' both talk about the size of an area or a surface. 'die Fläche' can mean a single area, for example part of a room, a piece of ground, or a surface. 'die Gesamtfläche', on the other hand, means the whole area together, that is, all partial areas as a total. Learners may confuse the words because both occur in measurements. Remember: 'Fläche' can be a part or a single area; 'Gesamtfläche' is always the whole.

Die Gesamtfläche der Wohnung beträgt achtzig Quadratmeter.
The total area of the apartment is eighty square meters.
Auf dieser freien Fläche können die Kinder Fußball spielen.
The children can play soccer on this open area.