Degree Measure o 1 ° = 1 / 360 th of rotation.( 1 complete rotation = 360 degree) o 1 ° = 60 ′( 1 degree = 60 minutes) o 1 ′ = 60 ″( 1 minute = 60 seconds) Lets draw 360 °, 180 °, 270 °, 410 °, – 30 °, 50 °
Notice that Angles 410 o & 50 o are same, Radian Measure: o
o
( 410 o-360 o) = 50 o
1 radian is the Angle subtended at centre by arc of length 1 unit in a circle of radius 1 unit.
One revolution = 2π radian