Respostas

2013-12-10T14:36:49-02:00
Dab^2=(xb-xa)^2 + (yb-ya)^2
dab^2=(3-(-1))^2 +(7-5)^2
dab^2=(4)^2 + (2)^2
dab^2=16+4
dab^2=20
dab=√20
dab=2√5