Posted by **Caroline** on Monday, January 12, 2009 at 4:48pm.

Can you help me with this problem:

Find a formula for the distance from the point (X1, Y2)

(The numbers next to X and Y are like X sub 1, Y sub 2...)

- Algebra (URGENT!) -
**bobpursley**, Monday, January 12, 2009 at 4:58pm
Given two points, x,y and X1,Y2, the distance between those points are

distance=sqrt((x-x1)^2 +(y-y2)^2 )

- Algebra (URGENT!) -
**Damon**, Monday, January 12, 2009 at 4:59pm
Perhaps from (x1,y1) to (x2,y2) ???

well, start at (x1,y1) and go right to (x2,y1)

you went (x2-x1) in the x direction

then turn straight up (a 90 degree turn up)

and proceed up to (x2,y2)

You went up a distance = (y2-y1)

NOW you have a right triangle and the hypotenuse, d, is the distance you want

d^2 = (x2-x1)^2 + (y2-y1)^2

so in the end

d = sqrt [ (x2-x1)^2 + (y2-y1)^2 ]

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