Question 69404
Use the distance formula:
d={{{( sqrt((x1-x2)^2+(y1-y2)^2)) )}}}
d={{{( sqrt((5-8)^2+(1-5)^2)) )}}}[plug-in the values(5,1)and (8,5) ]
d={{{( sqrt((-3)^2+(-4)^2)) )}}} [simplify]
d={{{( sqrt((9)+(16))) )}}}
d={{{( sqrt(25))) )}}}
d=5