Respuesta :

yashddsy26
(-π/4) ...... is the answer !!
apologiabiology
2pi radians=360 degrees
ratio and proprtion thing  I guess

r/2pi=-45/360
r/2pi=-1/8
times both sides by 8pi
4r=-pi
divide both sides by 4
r=-pi/4

-pi/4 radians