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= 2 ( 209 + 95 + 55 )
= 2 × 359
= 718
Maaf kalo salah !
= 2 x (19 x 11 + 19 x 5 + 11 x 5)
= 2 x (209 + 95 + 55)
= 2 x 359
= 718 cm²