Wednesday, September 30, 2015

Desmos calculator embedded in a blog!

Two posts in one day! What am I thinking!
Just read about something on the web anmd it tickled my brain regarding blogger and iframes,  so I said to myself "give it a try!".

Here is the page https://www.desmos.com/calculator embedded in the blog. It has shrunk, but all the parts are there.
A moral victory!!

Use the web wisely!

Readers of my blog know that I am a strong supporter of the use of dynamic GeoGebra in the classroom.  As we proceed through this new school year I will be continuing this campaign, but adding support for other online math options.  In order to gain my support, the material I propose must be:

  1. accessible via the web without any special software installation.
  2. capable of being embedded into blogs such as this one
  3. interactive
My goal is to create libraries of "teachable items" for use by teachers, freeing them from the need to create their own items in order to focus on their students.

The graphic here appears inert, but clicking on it brings you to a page where you can experiment, modify, play around,.... learn.


Monday, September 28, 2015

You can't make this stuff up

Here is a photo I took 6 months ago in Florida. I will keep the town and store nameless.

Just looking at it should be enough. No comment should be necessary.

The last time I checked frozen water was very low-cal, and might be good for you, too!

I just hope Yogi Berra got to see it.

Tuesday, September 22, 2015

Create a Slide Show in GeoGebra!!

Here is just an example as to how Geogebra can be used to create slide shows involving dynamic geometry.
It is actually pretty easy?
I can explain it if you catch me at the AMTNYS conference in Rochester this fall.
Otherwise, download the file here, and pick it apart!!

Thursday, September 17, 2015

Is this an ellipse?

GeoGebra allows us to do a lot of exploring. here is a construction that traces the result of 3 rotations. It looks like an ellipse. Is it?
For a larger display, visit the file at http://tube.geogebra.org/m/1634221
Carpe diem!

Wednesday, September 16, 2015

What is the shortest route?

Just imaging you have to visit 6 state capitals every trip, starting and ending every trip at the same state capital where you started.

GeoGebra has a fascinating capability, based on the famous "Traveling Salesman" problem, which is used here to find your route.

Drag the points around and see how quickly the new route is found!!

Tuesday, September 15, 2015

Pentagoning the Square???

This was created to help show that GeoGebra can be used to create presentations for the classroom. I certainly wish I had this when I was a classroom teacher!!

This particular one shows how a regular pentagon (equal sides, equal angles!) can be created from a square.
Have fun!!

I will be talking about this and a lot about GeoGebra in general at my presentation at AMTNYS in Rochester (currently I am scheduled at 3:45 on Sept. 12. See you there!!

Thursday, September 3, 2015

A limacon? ABOUT FACE! Call it a Rose!

This is something I discovered while just exploring with GeoGebra. It occurred as a result of my work exploring what I call "Floating Midpoints".
The complete file can be found here.

Wednesday, September 2, 2015

A Rose is a Rose is a Rose is a .....

Dynamic Geometry can be a great avenue for introducing seemingly complicated math topics to the younger students in lower grade levels.  It also can be used to deal with topics from different perspectives.
Here I am using GeoGebra to show how rose graphs, normally not seen in school until polar graphs are dealt with, could be introduced much much earlier.

In this graphic points M and n will be rotating around the circle in opposite directions. My next post will show what happens in some cases when the rotation of one of the points reverses direction.