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Verified answer
Diketahui =lebar karton = 40cm
panjang karton = 60cm
lebar foto = 40 - 3 - 3 = 34cm
panjang foto = 60 - 3 - x =( 57 - x )cm
ditanya = luas Karton yang tidak tertutup foto ?
mencari panjang foto
- panjang foto = 57 - x
= 57 - 6
= 51cm
- luas foto = p × L
= 51 × 34
= 1734cm²
- luas karton = P × L
= 60 × 40
= 2400cm²
- luas karton yg tidak tertutup foto
= 2400 - 1734
= 666cm²