S=√[p·(p-a)·(p-b)·(p-c), p=(a+b+c)/2=(13+14+15)/2=21⇒S=√(21·8·7·6)=84
S=15·h/2, h=2S/15=2*84/15=11.2
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S=√[p·(p-a)·(p-b)·(p-c), p=(a+b+c)/2=(13+14+15)/2=21⇒S=√(21·8·7·6)=84
S=15·h/2, h=2S/15=2*84/15=11.2