Toate împreună fac 360
a+a+5+a+5+5+a+5+5+5+a+5+5+5+5+a+5+5+5+5+5=360
5a+75=360
5a=360-75
5a= 285
a=285÷5
a= 57
primul unghi are 57 grade
al doilea are 57+5=62 grade
al treilea are 62+5=67 grade
al patrulea are 67+5= 72 grade
al cincilea are 72+5= 77 grade
al șaselea are 77 +5= 82 grade