How to find intersection between one line and its perpendicular passing by another point

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Clementine Bodin
Clementine Bodin le 12 Déc 2022
Réponse apportée : Joseph Cheng le 12 Déc 2022
Hi,
I cannot find a simple solution to find the coordinates of point d
I know the coordinates of a, b and c .
I need to know where the blue line passing by point c will cross the red line with angle 90 degrees (find d point)
Could someone help me ??

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Joseph Cheng
Joseph Cheng le 12 Déc 2022
you can follow the computation found here: https://diego.assencio.com/?index=ec3d5dfdfc0b6a0d147a656f0af332bd

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