B. 864 cm^2
lebar karton = 40 cm
pajang karton = 60 cm
lebar foto = 40 - 4 - 4 = 32 cm
foto dan karton sebangun, maka
pjg foto / pjg karton = lebar foto / lebar karton
pjg foto / 60 cm = 32 cm / 40 cm
pjg foto = (60 cm x 32 cm) / 40 cm
pjg foto = 48 cm
L karton = 40 cm x 60 cm = 2.400 cm^2
L foto = 32 cm x 48 cm = 1.536 cm^2
L karton yg tdk tertutup foto:
L = L karton - L foto
L = 2.400 cm^2 - 1.536 cm^2
= 864 cm^2
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Jawaban:
B. 864 cm^2
Penjelasan dg langkah2:
lebar karton = 40 cm
pajang karton = 60 cm
lebar foto = 40 - 4 - 4 = 32 cm
foto dan karton sebangun, maka
pjg foto / pjg karton = lebar foto / lebar karton
pjg foto / 60 cm = 32 cm / 40 cm
pjg foto = (60 cm x 32 cm) / 40 cm
pjg foto = 48 cm
L karton = 40 cm x 60 cm = 2.400 cm^2
L foto = 32 cm x 48 cm = 1.536 cm^2
L karton yg tdk tertutup foto:
L = L karton - L foto
L = 2.400 cm^2 - 1.536 cm^2
= 864 cm^2