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l karton = 18 cm
sisi kakan, kiri, dan atas = 5 cm
misal sisa bag bawah foto = x cm
maka:
p foto = 24 - (5 + x) = 19 - x cm
l foto = 18 - (5 + 5) = 8 cm
dgn kesebangunan, didapat
p karton / p foto = l karton/ l foto
24 / (19 - x) = 18 / 8
24 x 8 = 18 x (19 - x)
192 = 342 - 18x
18x = 342 - 192
18x = 150
x = 150/18
x = 8 1/3 cm
semoga membantu ya :)
pajang dlm = a
lebar luar = 18
lebar dalam = 18 - 5- 5
= 8
perbandingan
a/24 = 8/18 (kali silang)
18 x a = 8 x 24
18a = 192 /18
a = 10 12/18
= 10 2/3
sisa karto bawah
sisa = 18 - 10 2/3
= 8 - 2/3
= ( 24- 2)/ 3
= 22/3
= 7 1/3