March 14 is Pi Day. Mathematicians, teachers, and math geeks around the world celebrate.

Especially at 1:59. That’s when the date and time is 3/14 1:59 – pi to 5 digits.

My treat for you last year was a photo of pi decorated cookies. This year the treat is even more delicious – a Pi Song from Vi Hart and a Pi Limerick from me.

Vi Hart can sing!

You can’t deny Vi Hart has mathematical and creative talent. But who knew she had a musical voice!

My Pi Limerick – because I can’t sing.

I can’t carry a tune in a bucket much less associate digits with musical notes.

But I can remember pi to 5 decimal places with the help of this limerick:

Happy Pi Day, y’all!

4 Responses to Pi Day Videos – Song & Limerick

Why don’t you include Film-pi, a Mathdub made by Dutch Mathematicians? Watch here: http://youtu.be/yNpU1eI8K18

My highschool Trig teacher (Mr. Campbell — a good man!) taught us to remember the digits of pi by chanting the rhyme ‘sine, cosine, cosine, sine, 3.14159’.

The order of sines and cosines refers to how to apply Euler’s formula to sine [e.g. sin(x+y) = sin(x)cos(y) + cos(x)sin(y)]. Though I had to look up the formula, I have *never* forgotten the rhyme!

Have you seen these variations on the number 3? There’re also a few facts about three! Continue Reading

2 Responses to Variations on the Number 3

A 3-sided polygon, a triangle, is the only “rigid” shape. Any polygon with more than 3 sides is not rigid because it can be easily deformed. A triangle, by contrast, is strong because it resists deformation. Therefore, triangles are often used in construction. For example, “trusses” are structures made of steel beams in the form of triangles. Often, many smaller triangles are welded together to form larger triangles for greater strength. Trusses are used wherever strength is needed: bridges and supports of all kinds. The Eiffel Tower is made of trusses consisting of thousands of steel triangle-shaped constructions.

Do you practice fact families with your children? How about variations on different numbers? This is the first in a video series showing variations on numbers. Check it out! Continue Reading

Calculating the area of a right triangle includes remembering the formula, and doing the arithmetic correctly. Here’s a short video demonstrating it. Continue Reading

One Response to Area of a Right Triangle

You are so entertaining; I chuckled a few times through this! But “that’s just going a bit too far” (as you might say). : )

Why don’t you include Film-pi, a Mathdub made by Dutch Mathematicians? Watch here: http://youtu.be/yNpU1eI8K18

Very catchy, tune, Hans! Thanks for sharing it!

My highschool Trig teacher (Mr. Campbell — a good man!) taught us to remember the digits of pi by chanting the rhyme ‘sine, cosine, cosine, sine, 3.14159’.

The order of sines and cosines refers to how to apply Euler’s formula to sine [e.g. sin(x+y) = sin(x)cos(y) + cos(x)sin(y)]. Though I had to look up the formula, I have *never* forgotten the rhyme!

Thanks for the mnemonic tip, T.!