Which angular system is most commonly used in the United States?

The sexagesimal system, which is based on the division of a circle into 360 degrees, is the most commonly used angular system in the United States. This system is prevalent in various applications such as navigation, construction, and surveying, where angles are typically expressed in degrees.

The sexagesimal system is intuitive for many people because it breaks down degrees into minutes and seconds, allowing for more precise measurements and calculations when necessary. This is particularly useful in fields like surveying where accurate angles can significantly impact the results of measurements and calculations.

In contrast, the other systems mentioned—decimal degrees, radians, and the gradians—are used in more specialized contexts or in other countries. While decimal degrees may be familiar to some, the sexagesimal system remains the standard for general applications in the U.S. The use of radians is common in mathematics and certain scientific fields, while the gradian system is less widely adopted outside specific contexts. Hence, the sexagesimal system stands out as the predominant choice in everyday practice in the United States.