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Materi: Kesebangunan
P foto: 48 cm
L foto: 40 cm
--------------------------
L karton: 40 + (2,5×2) = 45 cm
P karton: ...? cm
Lebar karton bagian bawah yang tidak tertutup:
54 - (48+2,5)
54 - 50,5
= 3,5 cm
Semoga membantu!