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2014-04-09T20:30:04+03:00
AΔ=b*h/2=AA'*BC/2=3*2,5/2=7,5/2=3,75
AΔ=b*h/2=BB'*AC/2=BB'*4/2=2BB'

3,75=2BB'
BB'=3,75/2=1,875