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2014-11-07T10:11:23+02:00
M(ABC)/m(DEF)=1/3=>3·m(ABC)=m(DEF)
m(ABC)+m(DEF)=180
m(ABC)+3·m(ABC)=180
4·m(ABC)=180
m(ABC)=180/4
m(ABC)=45⇒m(DEF)=3·45=135
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