Erich Friedman designed [Try Angles|https://erich-friedman.github.io/published/angle/index.html], shared at the Puzzle Palace, alongside other geometry puzzles. Below is an interactive port. All solutions are unique and linked inside the original page.
Plus, there is a more recent puzzle by Jack Lance.
This published Series appeared in Games (May 2013).
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Acknowledgements and Changes
Thanks to Noa Hoffmann (Noa Cube Studio) for finding a missing dot in one of the puzzles, Martin Ender (Menderbug) for a missing rule & to Jack Lance for making a new puzzle!
2024-01-16 Added divisibility checkers to Dot Triangle Puzzles, Connect the Dots Puzzles and Try Angles, a suggestion by PinkHoodie
2024-11-07 Some improvements to the highlighting was performed, after PinkHoodie noticed some issues (cause: freesegments vs longsegments). Thank you.
2024-11-08 The rule panels of Try Angles were brilliantly modernised by PinkHoodie - thank you!
2024-11-16 puzzletters PinkHoodie constructed 1 Try Angles (classic) puzzle, making great use of this newly modernised genre!