How to measure the square foot of a house
This is a tape measure.
This one shows the measure in both imperial ( Inches and feet ) and metric ( centimeters and meters )
A meter is 100 centimeters
This is one foot as measured by the tape measure and
This is one foot squared or one square foot
Here we have a rough sketch of a floor plan drawn on ¼" x ¼" graph paper. in this drawing each square represents one square foot.