[tex]$ \ $ \ Folosim formula \triangle_{MNP} = \frac{b\cdot h}{2} \\ \\ b \rightarrow $ este baza, adica NP \\ h \rightarrow $ este inaltimea, adica MD \\ \\ \triangle_{MNP} = 20 $ cm^2 \\ h = $ 5 cm \\ \\ \Rightarrow 20= \frac{NP\cdot5}{2} \Rightarrow NP \cdot 5 = 40 \Rightarrow NP = \frac{40}{5}\Rightarrow NP = 8 $ cm[/tex]
