解设∠DOA为X∠COD为(X+30)
X+X+30=90
X=30
∠DOA=30 ,∠COD=60
应为OB是∠AOC的平分线
所以∠DOC=45
∠BOD=15
如图,已知∠AOC=90度,∠COD比∠DOA大30度,OB是∠AOC的平分线,求∠BOD的度数?
如图,已知∠AOC=90度,∠COD比∠DOA大30度,OB是∠AOC的平分线,求∠BOD的度数?
数学人气:516 ℃时间:2020-05-30 02:44:34
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