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36 : s x 4
s : 36 : 4
: 9
9 + 6 : 15
K : s x 4
: 15 x 4
: 60
60 - 36 : 24
Kalo bingung tanya aja!
sisi awal = K.awal/4 = 36/4 = 9 cm
sisi akhir = 9+6=15cm
keliling akhir = 15×4 = 60 cm
selisih = k.akhir - k.awal = 60-36=24cm