Question 256137
R(-2,1) S(-1,3) and T(2,1)
d(rs)=sqrt[(x2-x1)^2+(y2-y1)^2]
d(rs)=sqrt[(-1+2)^2+(3-1)^2]
d(rs)=sqrt[1^2+2^2]
d(rs)=sqrt[1+4]
d(rs)=sqrt5
d(rs)=2.236 ans.