I would like to ask technical drawing question.How do you draw arc with radius of 400 that pass through point A and tangent to the Red line as shown in attached image?Please show me the step-by-step and its construction geometry.Thank you in advancedery2024-01-29 01:20:13

Hi Mr. Philippe Joseph, can you answer my question please?

How to draw an arc with three known parameters ?-1- Offset the red line by 400 on the lower side.-2- Draw a circle of radius 400 centered on the point "A".-3- Draw a circle of radius 400 passing by the intersection between the offseted red line and the circle centered on the point "A".-4- Trim the circle on the red line and the green line and you have got your arc. 

[QUOTE=philippe JOSEPH]....-3- Draw a circle of radius 400 passing by the intersection between the offseted red line and the circle centered on the point "A"..... [/QUOTE]
... bearing in mind that there are two such Circles, and two resulting Arcs tangent to the red line through point A [unless point A is close enough to an end of the line that one of the tangency points would be off the end].

Hello Kent and Dery, I have placed in the CAD/BIM Blocks library my file :HOW TO DRAW AN ARC-PJH.dwg.I see only one arc but I can be wrong.

[QUOTE=philippe JOSEPH]Hello Kent and Dery, I have placed in the CAD/BIM Blocks library my file :HOW TO DRAW AN ARC-PJH.dwg.I see only one arc but I can be wrong.[/QUOTE]
Hi Mr. Joseph, can you create the CAD/BIM block that can be opened in AutoCAD 2014 please? Thanks
dery2024-01-31 09:37:43

It's in the CAD/BIM BLocks : HOW TO DRAW AN ARC-PJH-2014.dwg

Hi Mr. Joseph. I saw your drawing already. However I still don't understand. How do you obtain those angles? Please advance and explain.

Hi Mr. Joseph, currently I am at this step (please see attached image). Can you tell me please what should I do for the next step? Thank you so much.

Dery, the "step by step" method is in the CAD/BIM Block library.