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Tangent with Straightedge (Posted on 2008-03-13) Difficulty: 4 of 5
Let gamma be a circle with center O and P a point outside gamma.

Construct a tangent line to gamma through point P using a straightedge only.

Prove the construction.

See The Solution Submitted by Bractals    
Rating: 4.0000 (1 votes)

Comments: ( Back to comment list | You must be logged in to post comments.)
Glibly | Comment 3 of 8 |
I have a circle centre O on a line PQ. 

I lay my straight edge from point P to the edge of the circumference of circle γ and draw the line.


But!   But!  But I did choose the tangent point, where the straight edge touched the circumference!
Huh?  Yeah, sure I did it visual, what do you expect?

 See my next comment.  I puzzled about this and this did seem to be the only way to go

Edited on March 15, 2008, 7:54 am
  Posted by brianjn on 2008-03-15 07:53:03

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