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= 12 x 12
= 144cm²
K . alas = 4 x s
= 4 x 12
= 48cm
sisi limas = 10cm
L.permukaan = L.alas + 1/2 x K.alas x s
= 144 + 1/2 x 48 x 10
= 144 + 240
= 384cm²