a+b+c+d =360 grade
a =c-2 ; c =a+2
b =2a
d =b+4 => d =2a+4
a +2a + a+2 + 2a+4 =360
6a =360-2-4
6a =354
a =59 grade
b =2a =2*59 =118 gr
c =a+2 =59+2 =61 gr
d=2a+4 =2d *59+4 =122 gr
