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Kelas 8 MatematikaBab Kesebangunan
Ukuran karton
p = 60 cm
l = 40 cm
s = 3 cm
Lebar karton bagian bawah
= (2 . p/l - 1) . s
= (2 . 60/40 - 1) . 3
= (3 - 1) . 3
= 6 cm
Ukuran foto
p = 60 - 6 - 3
p = 51 cm
l = 40 - 3 - 3
l = 34 cm
Luas karton yang tidak ditutupi foto
= luas karton - luas foto
= (60 . 40) - (51 . 34)
= 2.400 - 1.734
= 666 cm²