Răspuns:
a) P(BMN) = 4√7 cm
b) P(ANMC) = 24 cm
Explicație pas cu pas:
[AM],[CN] mediane =>
AN = NB ; BM = MC ;
a)
P(BMN) = BN+NM+MB = (AB/2+AC/2+BC/2)
= 1/2(AB+AC+BC)
= 1/2×P(ABC)
= 8√7/2 = 4√7 cm
b)
P(ABC) = 28 cm
AC = 10 cm } => AB+BC = 28 - 10 = 18 cm
AN+CM = (AB+BC)2 = 18/2 = 9 cm
MN = linie mijlocie => MN = AC/2 = 10/2 = 5 cm
P(ANMC) = AN+CM + MN + AC = 9cm + 5cm + 10cm = 24cm