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Verified answer
10,5 m= 1050 cmKeliling jendela= 2(90+60)=300 cm
Sisanya 1050cm -300cm= 750 cm
K=2(90+60)
K=2(150)
K=300 cm
K=300/100
K=3 m
Panjang Sisa =10,5 m - 3 m=7,5 m