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3 : 4 : 6
3y : 4y : 6y
78 = 3y + 4y + 6y
78 = 13y
y = 78/13
y = 6
sisi a = 3y = 3 x 6 = 18 cm
sisi b = 4y = 4 x 6 = 24 cm
sisi c = 6y = 6 x 6 = 36 cm
luas =