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PR = 32
QS = 24
luas belah ketupat = 1/2 PRxSQ =
luas belah ketupat = 2x luas segitiga PQS
jadi
1/2 PRxSQ = 2 . 1/2 PQ. ST
coret 1/2 kiri dan kanan
32 . 24 = 2. 20 .ST
ST = 19,2 jawaban B