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α= miara najmniejszego
α+20*= miara kolejnego
α+20+20=α+40= miara nastepnego
α+40+20=α+60= miaras najwiekszego
α+α+20+α+40+α+60=360
4α=360-120
α=240/4
α=60*
katy maja;
60* 80* 100* 120*
k. beta = x + 20
k. gamma = x + 40
k. delta = x + 60
x + x + 20 + x + 40 + x + 60 = 360
4x = 360 - 20 - 40 - 60
4x = 240 |:4
x = 60
alfa = 60 st
beta = 80 st
gamma = 100 st
delta = 120 st