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perbandingan sisi sisi pada DEF
DF : EF : DE = 12 :15 :18 = 4 : 5 : 6
ABC sebangun DEF
perbandingan sisi ABC = 4 : 5 : 6 = 8 : 10 : 12
AC = 10
Maka
<A = <E
<B = < F
<C = > D
17)
perbandingan sisi DEF = FE : DE : DF = 24 : 32 : 46 = 12 : 16 : 23
ABC sebangun DEF , perbandingan sisi sisi ABC = 12: 16 : 23
AB = 12, AC= 16 ,maka BC = 23
DF = 46
BC = 23
DF - BC = 46 - 23 = 23