How to make an equilateral triangle out of square paper

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This page is for those who want the instruction to make an equilateral triangle out of square paper.

If you want to make a flower with three-petals or a calyx with three sepals, you need a paper with equilateral triangle shape instead of square. This page shows how to make an origami equilateral triangle from a square paper.

In this instruction, I used 15cm x 15cm origami paper. Of course, the folding method is independent of paper size.