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<ABC = 56
maka sudut yang lainnya sama besar (bkn 56), krn ada 2 sisi yg sama panjang = segitiga sama kaki
anggap 1 sudut yg sama = x
180 - 56 = 2x
124 = 2x
124 : 2 = x
62 = x
maka
<BAC = <BCA
62 = 62