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12x = 60
x = 60/12
x = 5
b. panjang sisi = 3x = 3 . 5 = 15 cm
6) keliling = 2(p+l) = 64 cm
p + l = 64 : 2 = 32 cm
perbandingan p : l = 5 : 3
5 + 3 = 8
p = 5/8 × 32 cm = 20 cm
l = 3/8 × 32 cm = 12 cm