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AC/DF = BC/EF = AB/DE = 2 : 1
2) sebangun,, sebab
<C = <C ( berimpit)
<D = < A (sehadap)
<B = < E (sehadap)
3) tdak sebangun, sebab
AC / AB tidak sebanding dengan DF/DE
A C/AB = 2,5 : 2 atau 5 : 4
DF/DE = 3 : 2,5 atau 6 : 5
4) sebangun
<A = < D siku-siku
<C = <E bersebrangan
<B = <B = bertolak belakang
5) sebangun
<D = <B (55°)
<E = <A (90°)
<C = <C (berimpit)