Convert the angle in degrees to radians.
Solution:-
Consider a circle of radius r. A center angle of 1 revolution (360 degree ) will subtend an arc equal to the circumference of the circle. Because the circumference of the circle equals 
, we see that 360 degree= 
.
Converting from degree to radian can be summarized as follows.
1 degree = 
radian
Now convert the given angle in degree to radian. Use the formula from above to write 1 degree in radians.
= -19 * 1 degree
= -19 * 
radian
radian.