Monday, May 3, 2010

It's Geometry Monday! There's a word for this.

I don't know what the word is, but I do know that there is a word for how a triangle is not going to change shape and is so stable. This phenomenon is at the heart of the reason that so many triangles are used in engineering--bridge building--other construction. Put together a triangle of three Popsicle sticks into a triangle. Unless you break it, it will stay the same shape.

It's what makes a three legged stool sit stable where a four legged stool wobble if one leg is even a few millimeters longer or shorter than the others.

Is there a theological significance in this solidity--stability of three?
A square or a rectangle is not like this. If you push on the corner of your Popsicle stick square, it will turn into a rhombus. The angles change easily. A rectangle turns into a parallelogram.

So here, from my walk the other day, is what happens to a square in real life.


Kerrie said...

Loved your quilt and love your photo on shapes! Fun! Thanks for the info about pic download changes, too. luv 'n' hugs, Kerrie

Paulie said...

No stability!

®osadimaggio63 said...

Hi Katney
interessante questa foto sulle forme geometriche....
Ma cosa pensi della teoria che ciò che è quadrato non potrà mai diventare rotondo ?
Buona giornata :-)

lizziviggi said...

Oh yes, I see what you mean! Very clever use of geometry in photography... and here I thought I'd never find math interesting. ;-)