Thanks so much for the well illustrated geometry, is exactly what i need to know! Problem solved.

Sorry for not being clear, please see sketch. Thanks so much for trying to help.

I know how to draw an arc that is tangent to 2 line or if one of the line is an arc using truetangent(byTIG) plugin but is there a way or plugin that can do it with 2 arcs?

@chris fullmer said:

Are you asking if there is a way to use the eraser tool where you can select certain lines, but skip over other lines?

• yes

Pilou- i use the eraser, holding click to select and then press the space bar after selecting. While still holding on the space bar i will release click and this will leave those i wanted selected. But i am not able to skip over unwanted lines and continue selecting. And what i am hoping is to select surfaces(most importantly) and lines too skipping over unwanted surfaces/lines. Hope i can be clear this time

I know using the eraser and hitting the space bar could select multiple edge/line at one go but it cannot select from multiple location crossing unwanted ones. Is there a way to multiple select surfaces like eraser on lines from multiple location and crossing unwanted ones?

Thanks for all the responses. Jakob's eraser and space key works perfectly! Thanks so much for the great tip!

Even better if we can have bigger eraser for bigger area selection in future.

Is there a way to select such as using the eraser which is so fast and useful? Sorry if it was answer already somewhere that i couldn't find.