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keliling =4x+5x+6x=35
15x =35
x=35/15
x=7/3
sisi terpanjang =6x=6(7/3)=14
sisi terpendek =4x=4(7/3)=28/3
jadi
selisihnya =42/3 -28/3 =14/3
= 210/15
= 14 cm
b) selisih terpanjang dan terpendek = 2/15 x 35
= 70/15
= 4 2/3 cm