Question

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Answer 1

a)

5y+20 +7y+16+10y+5y=2*180

27y+36 =2*180

y=(2*180-36)/27 =12°

b)

y+(180-45) +(180-80) +(180-120) = 2*180

y+180+180+180 -45-80-120=2*180

y+180 -45-80-120=0

y-65=0

y=65°

c)

90+90+7y+2y=2*180

9y=180

y=20°  

d)

2*70+2*y =2*180

70+y=180

y=110°

Answer 2

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