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the degree is 9
section d
x = 50°
z+127=180
z= 180-127
z= 53°
4.now,
x+y+z = 180°
50°+ y +53°=180
103°+ y = 180°
y = 180-103
y =77°
section b
AOC+COD+BOC= 180°. (angles in linear pair)
(x+10) +x+ (x+20)= 180
3x+30=180
3(x+10)=180
x+10=60
x=60-10
x=50°
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