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12 cm/10 cm = 24 cm/x
6/5 = 24/x
Kali silang,sehingga
6x = 120
x =120/6=20 cm
x=QR
12 cm : 24 cm = 10 : QR
1 : 2 = 10 : 2 ( 10 )
QR = 20 cm
Maaf susah nulisnya