Locate point using trilateration method

i have three cordinates (s1(x1,y1), s2(x2,y2), s3(x3,y3)) and distances between s1 and s0(d1), s2 and s0(d2), s3 and s0(d3)

how can i find point s0(x0,y0)

I will be grateful if you explain on a concrete example, Thanks.

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