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agar sebangun tinggi karton harus :
T = 45/25 x 30 = 54
sisa bawah = 54 - 45 - 5 = 4cm
= (2x45 / 25 - 1) x 5
= (90/25 - 1) x 5
= (18/5 -1) x 5
= (18/5 - 5/5) x 5
= 13/5 x 5
sisa karton = 13 cm
P (tinggi/panjang) = 45cm
L (lebar) = 25cm
a = sisa karton sebelah kiri, kanan, atas