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8x=60
x=7,5 jadi jawabannya D
2. 3/9=x/15
45=9x
x=5 jadi panjang PQ=5cm
3. 4/2=3/x
4x=6
x=6/4=3/2=1,5cm (panjang DA)
jadi panjang AB adalah DA+DB=3+1,5=4,5cm