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The typical area defined for an existing concentrated load or point load is based on standards in engineering, particularly concerning how loads are distributed over a surface. The information provided indicates that the area is classified as 25㎟ or 0.087inch².

This area reflects a standard practice for point loads, ensuring adequate load distribution while maintaining structural integrity. Concentrated loads are often applied to specific small areas, and having a defined area helps engineers and designers in calculating the allowable stress on materials. Using a standard area of 25㎟ is helpful for evaluating whether the supporting structures can withstand that particular load without risk of failure.

In comparison to the other options, they represent either larger or smaller areas that are not commonly used for point loads according to standard engineering practices. Therefore, the selection of 25㎟ as the area aligns with the recognized norms for defining concentrated loads in a way that balances safety and practical application in design and engineering calculations.