just multiply the numbers together
1unitsx1units = 1units2
another example would be..
2unitsx2units = 4units2
It is a unit rate.
A unit of volume with dimensions 1 unit x 1 unit x 1 unit is called a cubic unit. It represents the volume of a cube where each side measures 1 unit. In the metric system, this unit is commonly referred to as a cubic centimeter (cm^3), while in the imperial system, it is often called a cubic inch (in^3). Cubic units are used to measure the volume of three-dimensional objects.
A unit rate is a ratio in which the numerator or denominator is 1 unit.
It is 1 square unit.
It is 1 square unit.
You can't convert that. Square centimeters is a unit of AREA (2 dimensions), liter is a unit of VOLUME (3 dimensions).
A unit of area or as of farmland is called an acre.
Magnitude
Yes, the perimeter of a rectangle can be larger than its area. For example, consider a rectangle with dimensions 1 unit by 1 unit, which has a perimeter of 4 units and an area of 1 square unit. As the rectangle's dimensions change, especially when one dimension is much larger than the other, the perimeter can exceed the area even more significantly.
It wouldn't be called girth; instead, it would be called dimensions of a box. To find the dimensions, measure length x width. To know the area of the sides of a box, it would be length x width x depth (how tall it is).
You can't just convert any unit to any other unit. The units must be of a compatible type. Thus, you can convert a unit of length to another unit of length, a unit of area to another unit of area, or a unit of volume to another unit of volume.
Frequency has the dimensions of reciprocal time. The unit is "per second" also called "Hertz".