Question

Determine a distancia entre os pontos (2,-1) e (-1,3)

Answer 1

$d_{AB} = \sqrt{( x_{B} - x_{A})^2+( y_{B}- y_{A} )^2 }$

 ¨¨¨¨¨  x ¨¨ÿ ¨¨¨¨¨¨¨¨¨¨x¨¨y
A=  (2 , -1)  e  B= (-1, 3)

$d_{AB} = \sqrt{(-1-2)^2+(3-(-1))^2} = \sqrt{(-3)^2+(3+1)^2} = \sqrt{9+16} = \sqrt{25} =5$