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< PQR = 40 + [180 - (64+40)]
< PQR = 40 + 76
< PQR = 116
b. <QSR = < PQS (berseberangan)
<QSR = 40
c. <PSQ = [180 - (<QPS + <PQS )]
<PSQ = [180 - (64+40)]
<PSQ = 76
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