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2014-02-17T20:22:20+02:00
AD²=AE·AC⇒100=8·AC⇒AC=100/8=12,5 cm.
DC²=AC·EC=12,5(12,5-8)==12,5·4,5=56,25
DC=√56,25=7,5⇒BC=15 cm
Acum P_{ABC}=AB+AC+BC=12,5+12,5+15=40\ cm
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