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k=2(p+l)
k=2(6+4)
k=20 cm
perbandingan panjang dan keliling = 6 : 20 = 3:10
.
2.maksudnya besarnya apa ya? Lebarnya? Lebar = 10, luas = 10x15, lebar : luas = 10:10x15=1:15