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a) 2α+α= 180
3α=180/:3
α=60
b) 210+ 2β+4β= 360
6β=150/:6
β=25
c) γ+60+γ+γ-30 = 180
3γ=150/:3
γ=50
3a=180 /:3
a=60
210+ 2β+4β= 360
2B+4B=360-210
6B=150 /:6
B=25
γ+60+γ+γ-30 = 180
y+y+y=180-60+30
3y=150 /:3
y=50
3a=180
a=60
b)210+2b+4b=360
6b=360-210
6b=150
b=25
c)γ+60+γ+γ-30 = 180
3y=180-60+30
3y=150
y=50