Question

calcule a distância entre os dois pontos a(-1,3) e b(-1,1)​

Answer 1

d ab = √(Xb - Xa)² + (Yb - Ya)²

d ab = √[ -1 - (-1)]² + (1 - 3)²

d ab = √[ -1+1]² + (-2)²

d ab = √0² + 4

d ab = √4

d ab = 2

Answer 2

$\large \boxed{ \begin{array}{l} \sf{d_{A,B} = \sqrt{(x_A - x_B) {}^{2} + (y_A - y_B) {}^{2} } } \\ \\ \sf{d_{A,B} = \sqrt{(( - 1) - ( - 1)) {}^{2} + (3 - 1) {}^{2} } } \\ \\ \sf{d_{A,B} = \sqrt{0 {}^{2} + ( - 2) {}^{2} } } \\ \\ \sf{d_{A,B} = \sqrt{0 + 4} } \\ \\ \sf{d_{A,B} = \sqrt{4} } \\ \\ \boxed{ \sf{d_{A,B} = 2}} \end{array}}$