Question

Am nevoie de ajutor la această problema!​

Answer 1

a) DCllAB⇒AD=CM=3

DC=AM=2⇒MB=5

in ΔBCM avem: CB=4, BM=5, MC=3⇒inversul teoremei lui pitagora CB²+CM²=MB²⇒ΔBCM este dreptunghic in ∡C

b) pt a afla aria ne trebuie inaltimea CN (h)

AriaΔBCM=$\frac{CBxCM}{2}$=$\frac{4x3}{2\\}$=6cm²

6cm²=$\frac{MBxCN}{2\\}$=$\frac{5xCN}{2}$⇒CN=12/5=2,4 cm

AriaABCD=$\frac{2+7}{2}$ × 2,4=10,8 cm²