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.

4 comments:

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. ;-)