I need help what units are used when talking about area?

Usually square units are used when talking about area.

square-miles
centimeters-squared

and there are also units specifc to area, such as acre or hectare. If you want units for a particular topic then there are lots of examples such as barn which is used in physics. There are also many obsolete units.

When talking about area, there are several units that can be used to measure it. The choice of unit depends on the size of the area you are measuring and the system of measurement being used. Here are some commonly used units for measuring area:

1. Square Meter (m²): The square meter is the standard unit of area in the International System of Units (SI). It is commonly used to measure smaller areas. To find the area of a square or rectangle, multiply the length and width in meters.

2. Square Kilometer (km²): The square kilometer is used for larger areas, such as measuring the size of cities, countries, or continents. It is equal to 1,000,000 square meters. To find the area of a large region or landmass, multiply the length and width in kilometers.

3. Square Foot (ft²): In some countries, like the United States, the square foot is a common unit for measuring area. It is often used for measuring the size of rooms, houses, or plots of land. To find the area of a square or rectangle, multiply the length and width in feet.

4. Acre: The acre is commonly used for measuring large areas of land, especially in agriculture or real estate. One acre is equivalent to 43,560 square feet or about 4,047 square meters.

5. Hectare (ha): The hectare is widely used for measuring agricultural plots and land in many countries. One hectare is equal to 10,000 square meters or approximately 2.47 acres.

To determine the unit of measurement for a specific area, it is important to consider the context and the intended use of the measurement. Conversion between different units can be done using conversion factors or online unit conversion tools.