Draw a line with fixed length that starts from specific point and touches a line

[Anonymous]

Hello! As the photo below, I want to draw a line with fixed length(let's say it's 10)

and it starts from the point A

I want the end of the segment touches line l.

I know the distance between point A and l, so you may suggest just use pythagoras theorem.

but the number gets dirty so I could make the length of the line to exact 10.

do you have any suggestion? Thank you!!!

(segment starts from A, and the length is 10. end of the segment should touches line l)

[Tomislav.Golubovic · Accepted solution]

Draw a circle with a 10 radius then where that circle and line cross, that's the point you want?

[Anonymous]

exactly!! Thanks a lot