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60 = 1/2 x 4x x 6
60 = 12x
x = 5
panjang alas = 4 x 5 = 20 cm
60 = 4x x 6 : 2
60 = 2x x 6
60 = 12x
60 : 12 = x
5 = x
maka alas = 4x = 4(5) = 20 cm