Răspunsuri

2014-06-03T22:33:12+03:00
Se aplica in triunghiul MNP teorema cosinusului
cos M= \frac{ MN^{2}+ MP^{2}- NP^{2}   }{2MN*MP}
NP²=MN²+MP²-2MN*NP*cosM
NP²=4+9-2*2*3*(-1/2)=13+6=19
NP=√19
PMNP=MN+MP+NP=5+√19
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