Question

fie punctele A(1,3)si B(2,5) a)determinati vectorul AB
b) determinati vectorul BA
c) calculati |AB|​
!!va rog urgent !!

Answer 1

Răspuns:

a. AB=(xB-xA) i+(yB-yA) j

AB=1i+2j=>AB(1, 2)

b. BA=(xA-xB) i+(yA-yB) j

BA=-1i-2j=> BA(-1,-2)

c. AB=ai+bj=>AB=1i+2j

|AB|=radical (a^2+b^2)

|AB|=radical (1+4)=radical 5