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3 votes
1 answer
188 views

Geometric construction exercises

Many of you know dynamic geometry exercises in Euclidea; if not, here is one example. It lets you do a geometric construction and sends a message once you achieve the result. I am looking for a way to …
Anton Petrunin's user avatar
32 votes
2 answers
1k views

Term for "uncheckable constructions"

Is there a term for "uncheckable geometric constructions"? Say, Angle Trisection and Doubling the Cube are checkable; i.e., if the answer is given one can do finite Compass-and-straightedge construct …
Anton Petrunin's user avatar
6 votes
2 answers
744 views

Bolyai's construction

Here is Bolyai's construction (in Klein model), which I learned recently from answer of Will Jagy to this question. It is a Compass-and-straightedge construction of asymptotically parallel line in abs …
Anton Petrunin's user avatar