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- From: Sheila.King@f315.n103.z1.fidonet.org (Sheila King)
- Newsgroups: k12.ed.math
- Subject: MATH CONFERENCE
- Message-ID: <22694.2B1138E7@puddle.fidonet.org>
- Date: 22 Nov 92 17:55:00 GMT
- Sender: ufgate@puddle.fidonet.org (newsout1.26)
- Organization: FidoNet node 1:103/315 - Castle of the Four , Diamond Bar CA
- Lines: 64
-
- Hello Everyone,
-
- Well a few weekends ago I attended the CMC Conference in Palm Springs
- (CMC is California Mathematics Council--an affiliate of NCTM).
-
- It was an exciting conference, and I thought I would share a little of
- what I saw.
-
- First of all, this thing called a MIRA is _quite_ interesting. We are
- looking to incorporate them into our high school geometry course next
- year in order to improve the course and increase student understanding.
- Miras can be used to do ALL constructions that can be done with the
- traditional straightedge and compass, but they are much easier with a
- Mira. Plus, the Mira can do some constructions that you CAN'T do with a
- straight edge and compass.
-
- BUT what I found most interesting, was that a Mira can be used for so
- much more than just geometry. You can also construct conic sections and
- sine and cosine waves with the darn thing! I think Trig students using a
- Mira to construct a sine or cosine wave from the unit circle would have
- a much clearer understanding of where those graphs come from and what
- they mean. Also, the Mira can be used in lower level math classes to
- construct fractional lenghts of line segments, and thereby one can model
- addition, subtraction, and multiplication of fractions.
-
- I also saw Michael Serra himself (author of _Discovering Geometry_). He
- presented a session called "Patty Papers Geometry". The idea is to use
- those little wax paper squares that go between hamburger patties to
- teach principles of geometry. By folding, tracing, cutting, and using a
- straightedge to connect points, you can do all constructions on these
- little squares of paper. It's lots of fun and it's quicker than
- traditional construction methods. Apparently Serra has another book
- coming out around April of this year entitled (guess what?) _Patty Paper
- Geometry_. Based on his excellent geometry text, plus this very exciting
- session I attended at the conference, I would highly recommend this
- book.
-
- I also saw an interesting presentation on the TI-81 for use in class.
- One of the programs this presentor had on his calculator will graph a
- line at random and display it (you use the overhead device so all the
- students in the classroom can see the graph). Then, you let the students
- guess the coefficients A, B, and C in the equation Ax + By + C = 0 in
- order to get the same line. After the students guess the A, B, and C you
- enter them into the calculator and the calculator then graphs your guess
- line and the original line. The students can then see both lines and
- compare them and revise their guesses for A, B, and C. After they make
- new guesses you can now enter these and the calculator will graph the
- new guess line and the original line. Hopefully the new guess is closer
- than the first guess. Anyway, this revision procedure can go on for as
- long as the teacher likes, or when you think they get close enough to
- the line have the calculator graph a new one and start over.
-
- It is also possible to program the same type of thing for parabolas and
- probably other types of graphs as well. If anyone would like some tips
- for how to write such a program for the TI-81 (or even if you'd just
- like for me to input the program here) let me know.
-
- Sheila
- coming to you from Diamond Bar, CA (in Los Angeles County)
-
-
- --
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