Is there a simple way to set the length of a side of a triangle

[Jessica Kachur]

I am trying to show my student why the sides of 24, 50 and 17 won't form a triangle.  I made three segments and have them measuring these lengths, but if I move them, the lengths change.  Is there a simple way to lock the lengths and be able to move them around so that they can play with them and convince themselves that they can't make a triangle?

thanks

 

Jess Kachur
Mathematics Teacher, Whitnall High School
T3 Regional Instructor
Muka, CGC, TDI, Retired, CL2, CL3-F, CL3-S, CL3-H, TN-O, WV-N
and
C-ATCH Jibay, Sandy Acres lil' Phantom, AD, AJ, SSA, SG, SS, SR, NA, NAJ, TDI, CGC, ChST, ChSN, ChFH

[Scott Lockhart]

Create two of the sides as radii of circles to fix the lengths and then hide the circles.

Scott

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[Andy Kemp]

Or just measure the length of the segment and then right click on it, go to attributes, and lock it...

[Michael Houston]

There is a good Math Nspired activity that highlights this concept very well:
 
http://education.ti.com/calculators/timathnspired/US/Activities/Detail?sa=5024&t=5056&id=13160
 
I know Jennifer Wilson uses it alot with much success.
 
Mike Houston
 

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Date: Wed, 23 May 2012 15:03:52 +0100
Subject: Re: [tinspire] Is there a simple way to set the length of a side of a triangle
From: an...@kemp.co
To: tins...@googlegroups.com

[Jessica Kachur]

OMG, I tried that earlier and the lock never showed up!  Thanks andy some how you are magic and made it work from over the big pond and now I see the lock!

Thanks

 

Jess Kachur
Mathematics Teacher, Whitnall High School
T3 Regional Instructor
Muka, CGC, TDI, Retired, CL2, CL3-F, CL3-S, CL3-H, TN-O, WV-N
and
C-ATCH Jibay, Sandy Acres lil' Phantom, AD, AJ, SSA, SG, SS, SR, NA, NAJ, TDI, CGC, ChST, ChSN, ChFH

---

From: Andy Kemp <an...@kemp.co>
To: tins...@googlegroups.com
Sent: Wednesday, May 23, 2012 9:03 AM

Subject: Re: [tinspire] Is there a simple way to set the length of a side of a triangle