Question

a radian is created by tracing what measurement around a circle? (1 point) 30° arc diameter radius circumference

Explanation:

A radian is defined as the angle subtended at the center of a circle by an arc whose length is equal to the radius of the circle. So, a radian is created by tracing a length equal to the radius around the circle. The 30° arc is a specific angle measure in degrees, not related to the definition of a radian. The diameter is twice the radius, and the circumference is \(2\pi r\), neither of which defines a radian.

Answer:

C. radius