Question

http://prntscr.com/3lcsgd

Answer 1

Use distance formula: \[d = \sqrt{(x_2 - x_1)^2 + (y_2 - y_1)^2}\] where points are \((x_1,y_1)\) and \((x_2,y_2)\)

Answer 2

So you do know how to apply this formula?