Issue with creation of a 180° opposite point

I created the A36 point at a 45° on the A34-A32_a4

I then created the A37 at the opposite of point A35 Result is that Points A35, 36 and 37 are not aligned A check using the mirror function confirmed the issue. ![Capture d’écran du 2025-12-01 14-06-14|860x498] (upload://vVfZJfjyyY8Wk094G0K6Z9v5MLq.png) Puzzling. I must be doing something wrong but could not find where… Tunique2.sm2d (11,8 Ko)

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It’s because you’re assuming that A34, A36, A35 is creating a right triangle. It’s not. Look at the angle of Line_A34_A32_a4… it’s not at multiple of a 45deg angle:

image

Instead of using the Point Intersect Line and Axis… use the Point - Intersect Line and Perpendicular:

image .png)

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Thanks Doug. Still slightly puzzled as, looking at properties on my first screenshot, it was supposed to create a 45% A34 A36 A35 angle? As per your advise, I will use use the Point - Intersect Line and Perpendicular. Best Eric

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Hello, @bibgab

The reason why this isn’t mirroring correctly is because the line that you are mirroring from isn’t at 315°:

It’s 2.04° more, so the mirrored point isn’t on the line that is at 0°.

This is what it could look like:

Here’s your file back:

Tunique2a.sm2d (17.2 KB)

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