The answer depends on how simple of complicated the shape is. For a reasonably simple shape, break it don into shapes such as triangles, parallelograms and trapezia, and circles or ellipses. Measure the dimensions of these shapes in feet and then, using standard formulae, calculate their areas - which will be in square feet. Add the results together to get the area of the shape.
For more complicated shapes you may need to approximate the area using the above shapes to approximately match the shape.
you have to treat it like a square then subtract the missing areas
Multiply the diameter by 3.1415 NO - ignore that! Diameter x pi (3.1416) is the circumference, the distance around a circle. Square footage is area, so the correct formula is Area = 3.1416 times radius squared. The radius would be measured in feet.
Model each floor of the house with one or more rectangles, compute the area of each of these rectangles, and sum them to the total square footage. If the shape of you house if really complicated you may have to throw a triangle in there, but most houses can be approximated well enough using rectangles.
You don't. Its cubinc footage, not square footage.
In order to get the square footage you need to take 13' times 15' and you will get the square footage
1200
The square footage of Missouri is 368,063,520 feet
Multiplying length by width equals square footage
The square footage of a baseball field is 4,569ft2
The square footage of a lot measuring 81x180x113x180 is 20,340 square feet. Square footage is found by multiplying the length by the width of an area.
The square footage would be 25 times 12 or 300 square feet.
Read your own question! The square footage is 20!