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sudut sudut yg sehadap
P1 dgn Q5
P2 dgn Q6
P3 dgn Q7
p4 dgn Q8
sudut dalam sepihak
P4 dgb Q5
P3 dgn Q6
7. < P3 = 60
<Q5 = <P3 = 60 krn berseberangan
<P4 = 180 - <P3 (berpelurus)
<P4 = 180 - 60 = 120