Find the radian measure of an angle of - 280 degrees

-280 degrees.

To convert from degrees to radians, multiply the angle by π/180

-280° * π/180° = - 280π/180

Simplify - 280π/180

280 : 2 = 140

180 : 2 = 90

140 : 2 = 70

90 : 2 = 45

70 : 5 = 14

45 : 5 = 9

- 280π/180 ⇒ - 140π/90 ⇒ - 70π/45 ⇒ - 14π/9