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12x = 48
x = 48/12
x = 4
Panjang masing2:
3x : 12 cm
4x : 16 cm
5x : 20 cm
48 = 12x
48/12 = 12x/12
4 = x
x = 4
sisi 1 = 3 x 4 = 12
sisi 2 = 4 x 4 = 16
sisi 3 = 5 x 4 = 20
pembuktian = K = sisi 1 + sisi 2 + sisi 3
= 12 + 16 + 20
= 48 (sesuai dengan keliling yg dicantumkan di soal)
jadi panjang setiap sisinya adalah 12cm, 16cm, dan 20cm.