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Topic: common core geometry proofs
Replies: 10   Last Post: Aug 1, 2014 11:41 AM

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Alex Stern

Posts: 23
Registered: 1/30/05
RE: common core geometry proofs
Posted: Jul 15, 2014 12:58 PM
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We teach all of them....Alex

Alejandro Stern
Math Chairperson 6-12
From: <> on behalf of Lisa Clark <>
Sent: Monday, July 14, 2014 9:25 AM
Subject: RE: common core geometry proofs

Locus is still there?it is just hidden

NOTE: points on a perpendicular bisector of a line segment are exactly those equidistant from the segment?s endpoints.

This is from engage NY Geometry!!..just doesn't mention the word.

Do you teach all locus or just that??

also.. it has points of concurrency ..hidden as well

G.CO.C.10 Prove theorems about triangles. Theorems include: measures of interior angles of a triangle sum to 180°; base angles of isosceles triangles are congruent; the segment joining midpoints of two sides of a triangle is parallel to the third side and half the length; the medians of a triangle meet at a point.

Do you teach all points of concurrency or just the centroid ???

Too many questions.. does anybody know the answers??

not fair!! no workbooks..we just have to figure it out !!

And every district will teach it differently.
Students are at a disadvantage !!! OK I will stop complaining!!

On Mon, Jul 14, 2014 at 08:23 AM, Alex Stern wrote:

They did remove Locus also......Alex

Alejandro Stern
Math Chairperson 6-12
From: <> on behalf of Lisa Clark <>
Sent: Saturday, July 12, 2014 6:44 PM
Subject: Re: common core geometry proofs

This is what I am worried about?
The geometry curriculum did not take much out..(just logic...graphing parabolas....right??)

It added Trig and Transformations with proofs..more constructions...How are we going to have enough time to cover everything??

Looking at the modules, I do not see them giving enough days on Euclidean Geometry proofs..Those proofs take so much time !! You can't just jump into them..

Any thoughts??

Lisa Clark

On Sat, Jul 12, 2014 at 12:26 PM, Bruce Waldner wrote:

Way back in 1977, when NYSED allowed variances for Regents Examinations and the current curriculum was Math 9 (elementary Algebra), Math 10 (geometry), and Math 11 (algebra Two with Trigonometry), taught a Transformation Geometry Course to average and below average students where proofs were based on isometrics (rigid motions). Students had no more difficulty with proofs than they did in the state's Geometry course. They learned it that way. I think you are panicking because it is not the way you are used to doing it. Proofs through transformations are really no more difficult just different. Most students do have problems with proof of any style.

Sent from my iPad@

On Jul 12, 2014, at 10:33 AM, Tony George <<>> wrote:

I totally agree.
By the way are indirect proofs in the CC Geo.?

On Fri, Jul 11, 2014 at 4:18 PM, <<>> wrote:
I totally agree with Howard! One would only have to look at the statistics of the results on Euclidean proofs and coordinate/analytic proofs to see that the students are sufficiently challenged by them already. If only SED would read these posts and allow a little common sense to prevail !!!


Jim Fish

Mathematics Department Chair
JFK High School
305 Cayuga Creek Road
Cheektowaga, NY 14227
(716)897-7800 ext. 1120<tel:%28716%29897-7800%20%20ext.%201120>

"We the willing, led by the unknowing,
are doing the impossible for the ungrateful.
We have done so much for so long, with so
little, we are now qualified to do anything
with nothing."

......Mother Theresa of Calcutta<> wrote: -----
From: Howard Levine
Sent by:<>
Date: 07/11/2014 03:17PM
Subject: common core geometry proofs

I think the emphasis in the new core on proofs by transformations is excessive. I think it's hard enough for average students to remember the Euclidean postulates and theorems that are necessary for the traditional statement and reason proofs that are STILL required in the core, but to add the complicated wording of the transformation postulates and theorems is just too much. Euclidean proofs and proofs by analytic geometry are enough!
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Anthony George
Attica High School
3338 East Main St.
Attica, NY 14011
Math Dept. Chair

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