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42 = 12 + 12 + pr
42 = 24 + pr
42- 24 = pr
18 =pr
pq= 12 cm.
karena pq=qr, maka qr= 12 cm.
sehingga
pr = K - pq - qr
pr=42cm - 12 cm - 12cm
pr= 18cm.