Question

calcular a distancia entre os pontos a(-1;4)e b(3;2)

Answer 1

Usa a formula:
Raiz quadrada de (x2-x1)^2.(y2-y1)^2

x1=-1 y1=4
x2=3 y2=2

dentro da raiz (3+1)^2.(2-4)^2
raiz de 4^2.2^2
raiz de 16.4=4.2=8