Respuesta :

Radians * 180/pi
(9pi * 180)/pi
1620 pi/pi
1620 degrees
(9pi)*(180/pi)= 1620degrees
explaination:-
donot confuse degrees and radian conversion just see that as in degrees we donot need "pi" so we multiply with (180/pi) not with (pi/180) so that pi cancel with pi and we get degrees 
hope u got your answer.