Wrong values

I'm trying to calculate the distance when I do it manually I get different results from the one mathcad gives

Lp1 should be the same of LP1

I also need to write a program to make this function uses different fixed point , for example the first time it will use X1,Y1 (0,0) as fixed point and I get the values for Lp1 

the second time it uses x2,y2(2,0) as fixed point and I get the values for Lp2 

and repeat the process with the all points to get lp3, lp4 ... and so on