Sircar, Swati
(2019)
Impossible triangle on rectangular dot sheet - another proof.
At Right Angles (3).
p. 110.
ISSN 2582-1873
Abstract
In the TearOut for the November 2018 issue (page 43 Fun with Dot Sheets) Swati Sircar had ended with a tantalizing observation and the promise of proof. The observation was: Note that one type of triangle (with all three vertices on lattice points) is not possible. This is the equilateral triangle - An equilateral triangle can’t be drawn with lattice points as vertices. Elsewhere in this issue, Shailesh Shirali has provided four proofs of the same result. Here is one more from Swati!
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