Given points,
(x1,y1)=(2,9)
(x2,y2)=(10,6)
now the distance between two points is,
[tex]d = \sqrt{ {(x2 - x1)}^{2} + {(y2 - y1)}^{2} } \\ = \sqrt{ {(10 - 2)}^{2} + {(6 - 9)}^{2} } \\ = \sqrt{ {8}^{2} + {( - 3)}^{2}} \\ = \sqrt{64 + 9} \\ = \sqrt{73 \:} \: units[/tex]
