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How can I solve these equations using mathematica?


HI,members
    I have a equation group as fellowed:
(x1-x10)^2 + (y1-y10)^2= = a
.........................................1
(x2-x20)^2 + (y2-y20)^2 = = b
..........................................2
(x3-x30)^2+ (y3-y30)^2 = = c
................................................3
(x1-x2)^2+(y1-y2)^2 = = d1
...................................................4
(x1-x3)^2+(y1-y3)^2 = = d2
......................................................5
(x3-x2)^2+(y3-y2)^2 = = d3
...........................................................6

where x1,y1,x2,y2,x3,y3 are an unknown quantities, and othes are the
constant.

I have tried the function "Reduce "and "Solve",but the mathematica can
not  give me any result.
Can anyone give me some other advices or method to solve this problem.
Thanks


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