Sunday, June 7, 2015

479: Dihedral Angle


Saturday, June 6, 2015

478: Salinon Areas

source:

Thursday, June 4, 2015

477: How Many Knots?

from NCTM:

How many knots will form if you pull the ends of the string in opposite directions?


Tuesday, June 2, 2015

Sunday, May 31, 2015

475: Circle Theorems

Here are eight circle theorems, written by a Brit so you'll have to "translate" to American English ...
Are these the most important ones?
Are there any that are missing that you feel should be included in this group?





source:

474: Fractional Understanding


What insights does a student need to have before this problem is solvable?

Friday, May 29, 2015

473: Overlapping Squares

I might have posted this puzzle before.

What do your students think? Can they generalize it?
What is the overlapped area?
source: