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jika sebangun maka berbanding
karton = foto
3(35 - x) = 80
105 - 3x = 80
3x = 25
x = 8,33... jawabnnya C. 8 1/3
Ukuran karton : ↓
=>
=>
=> 40 × 20
x =>
x => 26,7 cm.
Luas karton dibawah foto : ↓
=> 40 - (5 + 26,7)
=> 40 - 31,7
=> 8,3 cm.
=> 8 ⅓ cm
Semoga membantu ya.