It is the way to calculate a given square's area. It is the definition of its area.
length x width = area
It is to calculate the extent of the shape in 2-dimensional space.
Calculate the area of the room. Calculate the area of the window (or whatever opening) Room Area*100/Window Area
There is no such thing as an "irregular rectangle". To calculate the area of a rectangle - if that's what you mean - you multiply length x width.
It is not possible to calculate the area given only the volume.
If by "it" you mean a circle, once you know the diameter, you can calculate its radius, its circumference, and its area.
Calculate the area to be covered. (A) Calculate the area per board or pack (B) Divide (B) into (A)
To calculate Cross Sectional Area: Width x Depth
to calculate the area of the front surface of a box you should
You need to:* Calculate the surface area * Calculate the volume * Divide the surface area by the volume
To calculate plinth area of a house, you would calculate the thickness of walls that external along with the entire carpet.