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<2+<6=180°
110°+<6=180°
<6=180°-110°
<6=70°
jumlah sudut segitiga adalah 180°,maka
<6+<5+<3=180°
70°+95°+<3=180°
<3 =180° -165°
=15°
jadi besar sudut nomer 3 adalah 15° (B)