### trigonometry

#### Triangle Geometry Query

I'm hoping someone can help me out. My trigonometry is a bit rusty! See link below. I know all three coordinates and all three distances. What I want to calculate are the coordinates of the red dot! I'm hoping it might be an easy answer for a mathematician out there? Click here to see illustration of the triangle and required coordinate

If triangle is isosceles: Find bisector vector, normalize it, take vector with length d3 from (X3,Y3) point DX = X1 + X2 - 2 * X3 DY = Y1 + Y2 - 2 * Y3 Len = Sqrt(DX * DX + DY * DY) RedX = X3 + d3 * DX / Len RedY = Y3 + d3 * DY / Len

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