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A degree is a unit of measurement used to describe the size of an angle, where 360 degrees make a complete circle. One degree equals π/180 radians, which is the mathematical way of expressing the same angle measurement.
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A degree (in full, a degree of arc, arc degree, or arcdegree), usually denoted by ° (the degree symbol), is a unit of measurement of a plane angle in which one full rotation is assigned the value of 360 degrees.
It is not an SI unit—the SI unit of angular measure is the radian—but it is mentioned in the SI brochure as an accepted unit. Because a full rotation equals 2π radians, one degree is equivalent to π/180 radians.