31. Perhatikan gambar berikut! C (2y + 10) (y + 10) ° 140° А B D Besar sudut BAC adalah ... A. 30° C. 50° B 40 D. 90°
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Materi : Garis dan Sudut
Sudut ABC
ABC = 180° - 140°
[ ABC = 40° ]
Nilai y
Konsep Segitiga ( 180° )
y + 10° + 2y + 10° + 40° = 180°
3y + 60° = 180°
3y = 120°
y = 120°/3
( y = 40° )
Kesimpulan
Sudut BAC = ( y + 10° ) = 50°
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