根据两点间距离公式,AB^2=(-2-6)^2+(-3-3)^2=100 AB=10 [^2指平方] BC^2=(-5-6)^2+(1-3)^2=125 BC=5√5 AC^2=(-5+2)^2+(1+3)^2=25 AC=5 由于AB^2+AC^2=BC^2,由勾股定理的逆定理,这是直角三角形,AB和AC是直角边,而直...