Which of the following is the unit of angular measurement?

The unit of angular measurement is primarily recognized as the radian, which is a widely used standard unit in mathematics and physics for measuring angles. A radian is defined based on the radius of a circle: it represents the angle created when the arc length is equal to the radius. However, degrees are also a common unit for measuring angles, where one full rotation is divided into 360 degrees.

Both radians and degrees serve to quantify angles, but radians are often preferred in scientific contexts due to their direct relationship with the properties of circles and trigonometric functions.

While gradient and percent are valid concepts in various contexts, they do not represent units of angular measurement. Gradient often pertains to the slope of a line or a change in value, typically in mathematical or geographical contexts, while percent is a way of expressing a number as a fraction of 100, commonly used in statistics and finance but not applicable for measuring angles.

Thus, the more precise answer to the question about the unit of angular measurement, given the context, is the degree, which is indeed used frequently in practical applications, despite the radian being more prevalent in theoretical contexts.