Question 160280
This site describes it in detail:
http://www.purplemath.com/modules/distform.htm
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find the distance between (4, -3) and (2, 5)
{{{ sqrt((x2-x1)^2+(y2-y1)^2) }}}
{{{ sqrt((2-4)^2+(5-(-3))^2) }}}
{{{ sqrt((-2)^2+(5+3)^2) }}}
{{{ sqrt((-2)^2+(8)^2) }}}
{{{ sqrt(4+64) }}}
{{{ sqrt(68) }}}
{{{ sqrt(2*2*17) }}}
{{{ 2sqrt(17) }}}
or
{{{8.246}}}