Hello, thesys!

If I understand the problem, there is an infinite number of answers.

I have two points and

i need to find point , defined by the intersection of and

The vectors are orthogonal, so that: .

How can i get the point ?Code:* * * R * o * * * * * * * * * * P o - - - - * - - - - o Q

We have a semicircle with diameter

Let bepoint on the semicircle.any

Draw chords and

Then: .