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= 1/3 x 12² x 8 = 384 cm²
L.alas= 12^2= 144 cm^2.
L.selimut = 4 × (12×10:2)
L.slmut = 4 × 60 = 240 cm^2
Jd, L.prmkaan = 240+144= 384 cm^2