何度もすみません💦
6)は円周角の定理より∠AOBは80度。
⊿AOBは二等辺三角形なので、
∠OAB=∠OBA=50度。
円周角の定理より∠ACBは40度。
⊿ABCで∠OAB+∠OAC=100度となるので、180-(100度+40度)=40度。
x=40度。
だと思います!
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