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*Bangun 1 :
(12-5) x 5 x 2
(7 x 5) x 2
35 x 2 = 70 cm
*Bangun 2 :
(12-8) x 8 x 2
(4 x 8) x 2
32 x 2 = 64 cm
*Bangun 3
15 x 12
= 180 cm
jadi,
bangun 1 + bangun 2 + bangun 3
70 + 64 + 180 = 314 cm