Working on the making 7 congruent triangles from the pieces of a triangle dissection question I realized it's possible to do even better! So here it is for extra points:
Use six lines to cut a triangle into nine congruent triangles.
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$\begingroup$ I assume that, like the other question, we cannot assume anything about the triangle's shape (it is arbitrary)? $\endgroup$– bobbleCommented Aug 30, 2020 at 20:10
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$\begingroup$ this one is easier than others $\endgroup$– Aakash MathurCommented Aug 30, 2020 at 20:21
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$\begingroup$ @bobble Yes, arbitrary triangle $\endgroup$– KikosCommented Aug 30, 2020 at 21:13
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3$\begingroup$ square numbers are easy. $\endgroup$– JasenCommented Aug 30, 2020 at 22:14
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1$\begingroup$ Actually, larger number is not always "better" than the smaller number. In this case, the 9 version is apparently (way) more trivial than the 7 version. $\endgroup$– athinCommented Aug 31, 2020 at 1:17
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