Mathematics Stack Exchange is a question and answer site for people studying math at any level and professionals in related fields. It's 100% free, no registration required.

Sign up
Here's how it works:
  1. Anybody can ask a question
  2. Anybody can answer
  3. The best answers are voted up and rise to the top

There is given convex quadrilateral ABCD. And internal bisectors of angle $<A$ and $<C$ intersect in point X. And internal bisectors of angle $<B$ and $<D$ intersect in point Y. And $<XAY = 90$ I'm struggling to do draw this construction , could anyone send me a photo of this construction?

share|cite|improve this question

Here is an example, created with Cinderella using a bisection algorithm to adjust the angle.

Example construction

share|cite|improve this answer
Cross reference: the preceding comment was restated as a full question. I don't have a ready answer yet. – MvG Dec 5 '12 at 13:25

Your Answer


By posting your answer, you agree to the privacy policy and terms of service.

Not the answer you're looking for? Browse other questions tagged or ask your own question.