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    You're reflecting Triple-fold???

    Module 2 Day 14 Challenge Part 4
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      bravekiwi M2 M5★
      last edited by debbie

      Module 2 Week 4 Day 14 Challenge Explanation Part 4

      You're reflecting Triple-fold???

      debbieD 1 Reply Last reply Reply Quote 2
      • debbieD
        debbie ADMIN M0★ M1 M5 @bravekiwi
        last edited by debbie

        @bravekiwi Yes, this is a really clever trick! You can think of it by first drawing three triangles based on the original path through the rectangle.

        M2W4D14ch4-triple-reflect.png

        Then we can reflect the green triangle and shift it down by one, and shift the purple triangle down twice so that they span a grid that is three times as tall:

        M2W4D14ch4-triple-reflect2.png

        The diagonal line here isn't necessarily a straight one; it happens to look like that because the green line looks like it's almost symmetric. In general, only the shortest path would give a straight line, because that would minimize the distance from start to finish. 🙂

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