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```       MATH TOOLS NEWSLETTER - FEBRUARY 4, 2006 - No. 36

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

***FEATURED TPOW
tPoW: Building a House
Suzanne Alejandre
http://mathforum.org/mathtools/tpow/22862/
Use a Java applet from the Freudenthal Institute to help
find the largest number of cubes and the smallest number
of cubes to make the house pictured in the problem.

***FEATURED ACTIVITY
Activity: Triangle Geometry
eNLVM (Utah State University)
http://mathforum.org/mathtools/activity/22444/
This eModule presents real-world problems that motivate
students to work with triangle geometry. Interactive worksheets
and diagrams with feedback help students learn to solve for
unknown angles and sides of triangles.

***FEATURED TOOL
Tool: Conic Sections
Tom Leathrum
http://mathforum.org/mathtools/tool/22764/
This applet allows the user to vary parameters in the
"generalized" conic equation, ax^2 + bxy + cy^2 + dx + ey + f = 0,
as well as displace graphs. Instructions and some discussion
included.

***FEATURED TOOL
Tool: Interpolation and Extrapolation: What is the Difference?
Scott A. Sinex
http://mathforum.org/mathtools/tool/22405/
The "interpolate or extrapolate" worksheet allows students
to discover the difference between the two terms graphically
with only an understanding of the equation of a line. The
"aluminum can data" worksheet, which assumes students are
familiar with linear regression, then explores the dangers of
extrapolation as the linear model appears to breakdown. The
instructions for usage are all included on each worksheet plus
additional information given via comment cells.

***FEATURED TOOL
Tool: Recursion
Shodor: Project Interactivate
http://mathforum.org/mathtools/tool/21749/
This activity graphs recursive functions of the form f(0) = C,
defining f(n) based on f(n - 1).

***FEATURED TOOL
Tool: Math Doodles: Double Traits
Daren Carstens
http://mathforum.org/mathtools/tool/22356/
Each figure is made up of three traits: shape, number, and
color. Click on any two figures to trade their locations.
Rearrange the figures in the grid so that figures bordering
each other share at least two traits. Earn points for every
figure that is part of a network linked to the center figure
on the grid.

***FEATURED DISCUSSION
Lil asks, "Has anyone tried any lessons using the Shodor
program? If so, how did it go? Any tips? I am still trying
to come up with an effective lesson for 8th grade Algebra
students."

***FEATURED DISCUSSION
Demise of Green Globs
David Sunburst replies, "I spotted this thread and thought
you would like to know that we and the product's authors have
just begun development on a Mac OSX version of Green Globs
that we hope can be released sometime in 2006."

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