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a. <SPQ = 1/2 (180) = 90 (menghadap diameter)
b. <PQS = 180 - < <SPQ - < PSQ = `180-90-80 = 10
c. <QRS = 1/2 (180) = 90 (menghadap diameter)
d. <QSR = <PQS = 10 (bersebrangan)
e. <SQR = <PSQ = 80 (bersebrangan)