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sisi 1 = 3a
sisi 2 = 4a
sisi 3 = 5a
K = 36 m
maka :
K = sisi 1 + sisi2 + sisi3
36 = 3a + 4a + 5a
36 = 12a
a = 36/12
a = 3 cm
jadi panjag setiap sisi :
sisi 1 = 3x3 = 9 cm
sisi 2 = 4x3 = 12 cm
sisi 3 = 5x3 = 15 cm