Question

A distancia entre os pontos M(4,-5) e N(-1,7) do plano x0y vale :
a) 14 b) 13 c)12 d)9.

Answer 1

                                                    
  D = V(7-(-5)² + (-1-4)²  =  V144+25 ==> 13

Answer 2

d(M, N) = √((x₂ - x₁)² + (y₂ - y₁)²)
d(M, N) = √((- 1 - 4)² + (7 - (- 5))²)
d(M, N) = √((- 5)² + (7 + 5)²)
d(M, N) = √(25 + 12²)
d(M, N) = √(25 + 144)
d(M, N) = √169
d(M, N) = 13

Resp.: Alternativa "B".