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L = 2(8×8 + 8×21 + 8×21)
L = 2(64 + 168 + 168)
L = 2(400)
L = 800 cm²
maap kalo salah
= 2((8 x 8)+(8 x 21)+(8 x 21))
= 2(64+168+168)
= 2 x 400
= 800 cm²