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b-kąt 2= 0,75a=3/4a
c-kąt 3= 1,25*0,75a=5/4*3/4a=15/16a
d-kąt 4 = 29/16a
a+b+c+d=360
a+3/4a+15/16a+29/16a=360
16/16a+12/16a+15/16a+29/16a=360
72/16a=360
a=360* 16/72 =80
b=80*3/4=60
c=80*15/16=75
d=29/16*80=145