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2014-08-05T11:06:25+03:00
A)A ΔABC= AB*AC*sin<BAC/2=  10*14 * sin<30/2=  10*7 *1/2= 5*7=35 cm²

b) fie BM_|_AC  =>d(B;AC)=BM

A ΔABC=35

A ΔABC=b*h/2=  BM*AC/2= BM*14/2=  BM*7

BM*7=35  =>BM=5  =>d(B;AC)=5