Se foloseste teorema inaltimii !
[tex]h=\sqrt{poiectia\;c_{1}\;\cdot\;proiectia\;c_{ 2}[/tex]
Stiim ca: [tex]c_{1}=4\cdot(c_{2})\;\;si\;\;c_{1}+c_{2}=78cm\\
\Rightarrow\;\;4\cdot{c_2}+c_{2}=78\\
c_{2} = 78:5=15,6cm\;\;si\;\;\\
c_{1} = 62,4cm[/tex]
⇵
[tex]h_{\Delta}=\sqrt{62,4\cdot15,6}=\sqrt{976,44}=31,2cm[/tex]
