besar sudut 8/5 radian

1 radian = 57.2 derajat
8/5 = 1,6

1.6 radian = 91.67 derajat

phi radian = 180°
22/7 radian = 180°
8/5 radian = 180 x 7/22 x 8/5 = 91,6°

jika soalnya 8/5 phi radian maka jawabannya
phi radian = 180°
8/5 phi radian = 8/5 x 180 = 288°