Odpowiedzi

2009-11-26T19:03:40+01:00
Α + β + γ = 180
α + (α + 20) + (α + 20 + 20) = 180
3α + 60 = 180
3α = 120
α = 40

β = α + 20 = 60
γ = β + 20 = 80