у4 = у1 + 30
x+x+30=180
2x=150
x=75
у1=75°
у4=180-75=105°
у2=у4=105°
у3=у1=75°
75; 105; 75: 105
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у4 = у1 + 30
x+x+30=180
2x=150
x=75
у1=75°
у4=180-75=105°
у2=у4=105°
у3=у1=75°
75; 105; 75: 105