如图,已知be cf分别是角abd 角acd的平分线。若角a=54度,角bgc=110度 求角bdc
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∠ABC +∠ ACB = 180° -54°
∠GBC + ∠GCB = 180° -110°
((∠ABC +∠ ACB) -(∠DBC +∠DCB))/2 +(∠DBC + ∠DCB) = ∠GBC + ∠GCB = 180° -110°
((∠ABC +∠ ACB)+(∠DBC +∠ DCB))/2 = 70°
(∠ABC +∠ ACB)+(∠DBC +∠ DCB) = 140°
180° -54° +(∠DBC +∠ DCB) =140°
180° -54° + (180 -∠BDC) = 140°
∠BDC = 180° +180° -54° -140° = 166°
∠ABC +∠ ACB = 180° -54°
∠GBC + ∠GCB = 180° -110°
((∠ABC +∠ ACB) -(∠DBC +∠DCB))/2 +(∠DBC + ∠DCB) = ∠GBC + ∠GCB = 180° -110°
((∠ABC +∠ ACB)+(∠DBC +∠ DCB))/2 = 70°
(∠ABC +∠ ACB)+(∠DBC +∠ DCB) = 140°
180° -54° +(∠DBC +∠ DCB) =140°
180° -54° + (180 -∠BDC) = 140°
∠BDC = 180° +180° -54° -140° = 166°
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