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It means that it is a right angle triangle
If you mean square foot the 415 square foot = 9.527089 e-3
The answer depends on their relative size: is the circle inside the square, the square inside the circle or something else?
It is called the interior of the square and sometimes the body of the square.
Your question is a little unclear, but if you mean the small square drawn on the inside corner of a right angle: it is simply a way of showing a 90-degree angle.