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tinggi = 9 cm
alas : tinggi = 5 : 3
tinggi : alas = 3 : 5
alas = tinggi + 6 cm = 9 cm + 6 cm = 15 cm
a)perbandingan tinggi : alas = 9 : 15, sederhanakan = 3 : 5
b)perbandingan alas : tinggi = 15 : 9, sederhanakan 5 : 3