php - Find perpendicular segments at ends of segment -

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find perpendicular segments

hello, i'm making application in have points (p0,p1), , need find points perpendicular segments @ end of (p0,p1)... namely, (a,b) , (c,d), of length $len. there similar question 1 in this post, unfortunately not sure how interpret answer... i'm using php project, solution can in language can translate later.

enter image description here

(a-e)/(l/2) = (p1-f)/l

and on...


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