THANKS

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THANKS
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THANKS
THANKS
 

THANKS
∵∠ABC＝∠C＝2∠A,∠A+∠ABC+∠C＝180
∴∠A+2∠A+2∠A＝180
∴∠A＝36
∴∠C＝2∠A＝72
∵BD⊥AC
∴∠DBC+∠C＝90
∴∠DBC＝90-∠C＝18°

THANKS thanks: Thanks thanks thanks Thanks! -Thanks. thanks thanks! thanks thanks! thanks thanks thanks thanks~ thanks thanks ,thanks!