Tearing Corners Off Triangles
The video below shows how to create an activity where students can “tear” the corners off a triangle and rearrange them along a protractor to demonstrate the Triangle Sum Theorem.
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February 23rd, 2010 at 2:31 am
I wanted to go back and see the video again. I couldn’t find it!
The blog comment that had the missing url was no longer there.
Please give me the url, I am in the middle of my notebook about triangle angle sums.
Thank you so much.
Alice Terner
February 23rd, 2010 at 7:54 am
This video is embedded in the blog post.
February 26th, 2010 at 4:18 am
Watched video three times, managed to reproduce triangle, torn edges and use with protractor.The one issue I had was coloring the background with out the triangle being affected.
William
February 27th, 2010 at 7:40 am
Works great with a quadrilateral and Smart’s new Circular Protractor!
March 3rd, 2010 at 7:03 am
Hello William, and thanks for the suggestion for the quadrilateral and circular protractor. As far as coloring the background (without the triangle being affected), the key is to decide what color you would like your triangle, and to choose this as your background color at the start. When you take the “pictures” of the corners (with the screen capture toolbar) the pieces will be this color. Be careful to leave the interior of the captured images colored when you “Set Picture Transparency” on these pieces. Also, you’ll have to “capture” the middle section of the triangle as well (if you want the triangle to be a different color than the background). Once all the colored pieces are captured, you can chage the background to a new color to differentiate it from the Triangle pieces. Written out, this seems like a lot of steps, but I hope this helps you to get the page to look the way you want.