## Posts tagged ‘symmetry’

### What an Amazing Date!

There are lots of good dates — meeting at a bookstore coffee shop for, well, perusing books and sipping coffee; spending hours playing Super Mario Bros. and Pac-Man at a retro video game arcade; and, of course, going to an open-mic comedy show where one of the performers tells nothing but math jokes.

But great dates? Well, those are pretty rare. My first date with my wife — where I took her to a hotel and “whispered” to her from the couch across the lobby — is an example, though the stimulating conversation and her perfect laugh may have contributed more than the elliptical ceiling. (Maybe.)

Few dates, however, can compare to today’s date:

12/3/21

Look at that beautiful symmetry! Marvel at its palindromic magnificence! The way it rises then falls, like a Shostakovich melody.

But wait… there’s more! Consider the following pattern:

1 × 1 = 1

11 × 11 = 121

111 × 111 = ?

That’s right! The number 12,321 is a perfect square! And not only that, its square root contains only 1s.

Moreover, check this out:

1 + 2 + 3 + 2 + 1 = 9

That’s right! It’s a square number, and the sum of its digits is also a square number!

Finally, here’s a KenKen puzzle that makes use of the number, though it’s not unique unless one of the digits is already filled in:

No matter how you choose to celebrate, here’s hoping your day is as great as the date!

### QRack the CODE on this Qrossword

My eighth-grade English teacher told us, “You must learn the rules of grammar. They are very important, and you can not feel comfortable breaking them until you thoroughly understand them.” I believe this philosophy also applies to crossword puzzles. Typically, crossword puzzles must be constructed so that the grid is rotationally symmetric. Recently, I created a crossword puzzle, but I had a very good reason for violating the symmetry rule, so I did.

I now present the puzzle for your enjoyment. Enjoy.

QRack the CODE Qrossword Puzzle

Many mathy folks enjoy crossword puzzles. But in case you’re visiting just for the jokes and have no interest in crossword puzzles, here are a couple of jokes for you (crossword-related, of course).

A gentleman heard a rumor that the Pope might be taking the same flight to Italy. He thought, “This is great! I’ve been a Catholic my whole life, and I might get to meet the Pope!”

The man takes his seat. A few minutes later, the Pope sits in the seat next to him. Shortly after take-off, the Pope pulls out a crossword puzzle. After a few minutes, the Pontiff turns to the man and says, “Excuse me, sir. Do you know a four-letter word for ‘woman’ that ends U-N-T?”

The man thought for a few seconds. “Your Holiness,” he said, “I think the word you’re looking for is AUNT.”

“Oh, of course,” said the Pope. “Do you have an eraser?”

The following crossword joke could easily be modified for a plane geometry class.

Showing his map of attractions to a local, the tourist said, “Sir, I understand that a shrine to the creator of the crossword puzzle is near here. Do you know how to get there?”

The local pointed to a spot on the map. “You’re here,” he said. “The shrine is three down and four across.

## About MJ4MF

The Math Jokes 4 Mathy Folks blog is an online extension to the book Math Jokes 4 Mathy Folks. The blog contains jokes submitted by readers, new jokes discovered by the author, details about speaking appearances and workshops, and other random bits of information that might be interesting to the strange folks who like math jokes.

## MJ4MF (offline version)

Math Jokes 4 Mathy Folks is available from Amazon, Borders, Barnes & Noble, NCTM, Robert D. Reed Publishers, and other purveyors of exceptional literature.

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