Tentukanlah besar sudut! No.7

7.a.180-120=60°
b.180-(60+55)=180-115=65°
c.180-65=115°
d.180-115=65°

klok kurang jelas komen ya....

a.
<abc = 180 - 120
<abc = 60°

b.
<acb = 180 - (60 + 55)
<acb = 180 - 115
<acb = 65°

c.
<acg = 180 - 65
<acg = 115°

d.
<fcg = 180 - 115
<fcg = 65°