Square footage is an area - i.e a length (measured in feet) multiplied by a width (again, measured in feet).
To measure square feet, measure the length, and width you require, then multiply them together. The resulting number is the "square footage".
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Your question does not make sense. 100 yards is a measure of length, but square footage is a measure of area.
Measure the length and height of thesign using a foot measure. Then multiply the lenght by the height and this will give you the square footage of the sign.
You can't, a hole has volume and thefore needs to be measured in cubic footage. Square footage is a measure of area not volume.
If your wanting the entire square footage you can measure the width and length of your home from the outside. If your wanting to know the square footage of the heated space, measure each room width and length that have air ducts. Multiply the width and length measurements.
Four dimensions?