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O itu titik tengah
AT = AT (sisi)
<T = <T (sudut)
TB = TD (sisi)
s, sd, s
2) CTB ~~CTD
CT = CT (sisi)
<T = <T (sudut)
TB = TD (sisi)
3) ACB ~~ ACD
AC = AC (sisi)
<B = <D (sudut)
AB = AD (sisi)