How you get measurements to figure out area depends on a number of things:
You could measure the area of a
Measuring: Use a 12" ruler, 18" ruler, a yardstick (3 feet) or tape measure (also 3 feet), or a longer tape measure. Measure the length, then the width. Multiply length times width.
Very big areas, like land or farmlands: Surveyors use special tools to sight landmarks and find the number measurements.
The measurements that you need to find the area of a square is Area = Length x Width.
Area
they are both measurements
The area
Area of a parallelogram in square units = base*height
The area of any circle in square measurements = pi*radius2
The units are incompatible. Cubic measurements are for volume, square measurements are for area.
In square units of measurements
The units are incompatible. Cubic measurements are for volume, square measurements are for area.
To find the area of the door, get its length and breadth measurements then multiply them.
Area of any circle in square measurements = pi*radius2
Area is 8x+16.