A "270-degree" angle is an angle that measures 270 degrees, which is three-quarters of a full circle. In geometric terms, a full circle is 360 degrees, so a 270-degree angle represents a rotation that goes counterclockwise from the starting point, stopping at the negative y-axis on a coordinate plane. In practical applications, a 270-degree angle can be seen in various fields, such as engineering and architecture. For example, when designing a wheel or a gear, understanding angles like 270 degrees is essential for ensuring proper alignment and functionality in mechanical systems.