**Q: **Is a radian the standard unit of angular measure? ¶

**A: **Yes, and used in many areas of mathematics.

**Q: **Is a radian just under 1/6283 of a circle? ¶

**A: **Yes.

**Q: **Is a radian a unit of measure? ¶

**A: **Yes, and it is a dimensionless quantity.

**Q: **Is a radian widely used in physics when angular measurements are required? ¶

**A: **Yes.

**Q: **Is a radian equal to 180/π degrees? ¶

**A: **Yes.

**Q: **Are radians equal to 360 degrees? ¶

**A: **Yes, and meaning that one radian is equal to 180/π degrees.

**Q: **Is a radian a "pure number" that needs no unit symbol? ¶

**A: **Yes, and in mathematical writing the symbol "rad" is almost always omitted.

**Q: **Are radians assumed? ¶

**A: **Yes, and when degrees are meant the symbol ° is used.

**Q: **Is a radian represented by the symbol rad? ¶

**A: **Yes.

**Q: **Is a radian now considered an SI derived unit? ¶

**A: **Yes.

**Q: **Is a radian the angle subtended at the center of a circle by an arc that is equal in length to the radius of the circle? ¶

**A: **Yes.

**Q: **Is a radian just under 57? ¶

**A: **Yes.