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```   MATH TOOLS NEWSLETTER - SEPTEMBER 4, 2009 - No. 79

As you browse the catalog, please take a moment to rate a
resource, comment on it, review it -- join an existing
conversation, or start a new discussion!

***FEATURED DISCUSSION
Mathematical collaboration tools
karajo wonders, "Is there some conference / whiteboard
tool that includes equation editors, geometry support,
latex support, etc.?"

***FEATURED DISCUSSION
math fair project
frexxx explains, "I want to join the math fair project
competition in our division with my students. I just want
to get some project ideas in math [which] I can suggest to
my students for their entry. Please give me some ideas
where we can concentrate and develop."

***FEATURED SUPPORT MATERIAL
Support Material: Hypotrochoid
http://mathforum.org/mathtools/support/86756/
Math Images
This Math Images page catalogs the hypotrochoid, along
with a basic description, mathematical explanations,

***FEATURED TOOL
Tool: Math Images Tool: Hypotrochoid
http://mathforum.org/mathtools/tool/86754/
Steve Lombardi
There are three subgroups within the Hypotrochoid family.
The point P can be in three different general locations in
relation to the rolling circle: inside, outside, or on the
edge. The user of this applet can change the radius of the
inner and outer circles as well as the distance of point P
to the center of the circles.

***FEATURED TOOL
Tool: Function graphing tool - Math Open Reference
http://mathforum.org/mathtools/tool/86519/
John Page
A free web-based function graphing tool. Graph up to three
different functions on the same axes. Functions can refer
to up to three independent variables controlled by sliders.
As you move the sliders, the graphs change in real time to
reveal the effects of the variables.

***FEATURED TOOL
http://mathforum.org/mathtools/tool/85584/
Jamie Tubbs
A SmartBoard mini-movie is a simple, interactive animation
Notebook presentations. Most of these dynamic Flash files
require only a click of the mouse, similar to the same
files that are already included in SMART Notebook's
resources. Currently, the library of math related mini-
movies include ones on geometry, basic algebra, number

***FEATURED ACTIVITY
Activity: A Min/Max Problem
http://mathforum.org/mathtools/activity/86120/
Pat Ballew: Explorations in Geometry
A guided exploration, using Geometer's Sketchpad, of the
area of a triangle formed between two fixed rays, using a
third ray with a movable end point.

***FEATURED ACTIVITY
Activity: Geometry Quickies #1
http://mathforum.org/mathtools/activity/85572/
Pat Ballew: Explorations in Geometry
The activity based around medians in this series may
generate some questions. Here is a further exploration of
the topics it raised, again with reference to

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