1. 5.
a1b1=ab=120 y- углы
ab1=a1b=180-120=60 2(y1+y3)=y2+y4
2. y1=y3 y2=y4
y- углы 2y1=2y2
y1+y3=70 y1=y2=y3=y4=360/4=90
y1=y3 70/2=35
y2=y4=180-y1=180-35=145 6.
3. y-углы
mn1+m1n1+m1n=240 у1+у2+у3=5у4
mn=360-240=120 у1=у3 у2=у4
2у1=6у4
у1=3у4
у1+у4=180
3у4+у4=180
4у4=180 у4=45
7.
у -углы
y1=y2+y3
y2=y3
y1=2y2
y1+y2=180
3y2=180
y2=60=y3 y1=2*60=120