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2014-05-20T15:59:37+03:00
 m(ABF)=180 
m(ABF)=m(ABC)+m(CBD)+m(DBF)
180=m(ABC)+35grd15min+90
m(ABC)=90-35grd15min
m(ABC)=89grd60min-35grd15min=54grd45min


m(CBF)=m(FBD)+m(DBC)=90+35grd15min=125grd15min
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