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2014-08-14T18:20:20+03:00
                                                                      AC/CB=3/7      AD/DB=9/11
A-----------C-------D-------------------------B         (AC+CB)/CB= (3+7)/7       120/CB=10/7   ⇒ CB=84cm  ⇒AC=120-84=36cm            (AD+DB)/DB=(9+11)/11      120/DB=20/11 ⇒DB=66cm ⇒  AD=54cm                      CD=AD-AC=54-36=18cm
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