Question

calcule a distancia entre os pontos A(2,-1) B(3,-7)

Answer 1

A=(2,-1) B=(3,-7)
Xa=2, Ya=-1; Xb=3, Yb=-7

D= \sqrt{(Xb-Xa)^{2}+(Yb-Ya)^{2}  }
D= \sqrt{ (3-2)^{2} + [-7-(-1)]^{2}   }
D= \sqrt{1^{2} + (-6) x^{2} } 
D= \sqrt{1 +36}
D= \sqrt{37}
D=6,08

Answer 2

                                             
Dab= V(x2-x1)^2 +(y2-y1)^2

Dab=V(3-2)^2+(-7-(-1))^2

Dab=V 1^2+(-7+1)^2

Dab=V 1 + 36

Dab = V37

Dab= 6,08