The coordinates of site A are (5,20) and the coordinates of site C are (25,5).
The distance between two points is given by:
[tex]d(A,B)=\sqrt[]{(x_2-x_1)^2+(y_2-y_1)^2}[/tex]
Then, in this case we have:
[tex]\begin{gathered} d(A,C)=\sqrt[]{(25-5)^2+(5-20)^2} \\ =\sqrt[]{20^2+(-15)^2} \\ =\sqrt[]{400+225} \\ =\sqrt[]{625} \\ =25 \end{gathered}[/tex]
Therefore the distance between sites A and B is 25 ft.
