Jawab :
AD = AB
2 × sudut ABD + 130° = 180°
ABD = 25°
<C = <D = 180° - 130° = 50°
<CBD = 180° - 2 × 50° = 80°
<ABD = 25° + 80° = 105°
Jadi, jawabannya adalah 105°
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Jawab :
AD = AB
2 × sudut ABD + 130° = 180°
ABD = 25°
<C = <D = 180° - 130° = 50°
<CBD = 180° - 2 × 50° = 80°
<ABD = 25° + 80° = 105°
Jadi, jawabannya adalah 105°