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File:Two square counting puzzles.svg

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Summary

Description
English: Two square-counting puzzles: There are 14 squares in a 3x3 grid of squares (top), but when viewed as a 4x4 grid of points, it has six more off-axis squares (bottom) for a total of 20.
Date
Source Own work
Author David Eppstein

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I, the copyright holder of this work, hereby publish it under the following license:
Creative Commons CC-Zero This file is made available under the Creative Commons CC0 1.0 Universal Public Domain Dedication.
The person who associated a work with this deed has dedicated the work to the public domain by waiving all of their rights to the work worldwide under copyright law, including all related and neighboring rights, to the extent allowed by law. You can copy, modify, distribute and perform the work, even for commercial purposes, all without asking permission.

Captions

Two square-counting puzzles: There are 14 squares in a 3x3 grid of squares (top), but when viewed as a 4x4 grid of points, it has six more off-axis squares (bottom) for a total of 20.

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20 March 2025

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File history

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Date/TimeThumbnailDimensionsUserComment
current07:34, 21 March 2025Thumbnail for version as of 07:34, 21 March 2025504 × 324 (6 KB)David EppsteinReorder elements to make grid points visible over red squares
07:24, 21 March 2025Thumbnail for version as of 07:24, 21 March 2025504 × 324 (6 KB)David EppsteinUploaded own work with UploadWizard

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