Question

Daca se dau punctele A(2,1) si B(5,5) , atunci lungimea segmentului AB este???

Answer 1

[tex]AB= \sqrt{(x_B-x_A)^2+(y_B-y_A)^2} = \sqrt{(5-2)^2+(5-1)^2} = \sqrt{3^2+4^2}\\\\ = \sqrt{9+16}= \sqrt{25} =5[/tex]