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Verified answer
Ukuran sisi jendela = 0,5 m = 50 cmukuran sisi kaca = 50-5-5 = 40 cm
Luas jendela = s²
=50²
= 2500 cm ²
Luas kaca =s²
= 40²
=1600 cm²
Luas lis kayu = 2500 - 1600 =900 cm²