Question

Va rog sa imi amintiti, multumesc!

A(1,2)
B(5,-1)

d(A,B) = ?

Answer 1

$d(A,B)=AB. \\ \\ AB= \sqrt{(x_a-x_b)^2+(y_a-y_b)^2}}= \\ \\ ~~~~~~= \sqrt{(1-5)^2+[2-(-1)]^2}}= \\ \\ ~~~~~~=\sqrt{4^2+3^2}= \\ \\ ~~~~~~= \sqrt{25}= \\ \\ ~~~~~~=5~(cm).$