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keliling = panjang + panjang + lebar + lebar
keliling = 30 + 30 + lebar + lebar
keliling = 60 + lebar +lebar
100 = 60 + lebar + lebar
60 tambah berapa hasilnya 100 dibagi dua
=40 dibagi 2
=20cm
dibagi 2 karena lebar nya juga harus cari 2
Keliling = 100 CM
Ditanya Lebar = .......?
Keliling = p+p+l+l
100 = 30+30+l+l
Lebar = (100 - ( 30+30 )) : 2
= (100 - 60) :2
= 40 :2
= 20
Memastikan,
K = p+p+l+l
= 30+30+20+20
=100