Read e-book online Geometric Magic Squares: A Challenging New Twist Using PDF

By Lee C. F. Sallows

ISBN-10: 0486489094

ISBN-13: 9780486489094

This leading edge paintings by way of a British engineer initiates a Copernican revolution in our realizing of magic squares through exchanging numbers with two-dimensional types. the result's now not in basic terms a unique type of geometrical magic sq. yet a revelation that conventional magic squares are actually higher obvious because the one-dimensional example of this self-same geometrical activity.

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Extra info for Geometric Magic Squares: A Challenging New Twist Using Colored Shapes Instead of Numbers

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Finally, why did Liu Hui dissect the three squares into exactly fourteen pieces as opposed to twenty? Archimedes (287BCE212BCE), a Greek and one of the three greatest mathematicians of all time—Isaac Newton and Karl Gauss being the other two—may provide some possible answers. 15 on the next page. In the Stomachion, a 12 by 12 square grid is expertly dissected into 14 polygonal playing pieces where each piece has an integral area. Each of the fourteen pieces is labeled with two numbers. The first is the number of the piece and the second is the associated area.

My own intuition tells me that two complimentary observations were made: 1) the area of the lightly-shaded square and rectangle are identical and 2) the area of the non-shaded square and rectangle are identical. Perhaps both observations started out as nothing more than a curious conjecture. However, subsequent measurements for specific cases turned conjecture into conviction and initiated the quest for a general proof. 10. Euclid’s proof follows on the next page. 10: Annotated Windmill 38 First we establish that the two triangles IJD and GJA are congruent.

41 We close this section with a complete restatement of the Pythagorean Theorem as found in Chapter 2, but now with the inclusion of the converse relationship A 2  B 2  C 2    90 0 . Euclid’s subtle proof of the Pythagorean Converse follows (Book 1 of The Elements, Proposition 48). The Pythagorean Theorem and Pythagorean Converse Suppose we have a triangle with side lengths and angles labeled as shown below. 12 on the next page shows Euclid’s original construction used to prove the Pythagorean Converse.

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Geometric Magic Squares: A Challenging New Twist Using Colored Shapes Instead of Numbers by Lee C. F. Sallows

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