Question

Distanta dintre punctele A(1,2) si B(5,-1) este egala cu: A.2 B.3 C.4 D.5

Answer 1

   
[tex]d_{A,B} = \sqrt{(B_x -A_x)^2+(B_y -A_y)^2} = \\ \\ = \sqrt{(5 -1)^2+(-1 -2)^2} = \\ \\ = \sqrt{(4)^2+(-3)^2} = \sqrt{16+9} = \sqrt{25} = \boxed{5}[/tex]

Raspuns corect:  D