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A3 tolak belakang A2, A3=A2=80
A4 tolak belakang A1, A4=A1=100
B1 sehadap A1, B1=A1=100
B2 sehadap A2, B2=A2=80
B3 sehadap A3, B3=A3=80
B4 sehadap A4, B4=A4=100
b. LA3=180°-LA1=180°-100°=80°
c. LA2=180°-LA1=180°-100°=80°
d. LA4=LA1=100°
e. LB2=LA2=80°
f. LB3=LA3=80°
g. LB4=LA4=100°