Test Your Hand and Eye

Ready to see how good you are at drawing circles and finding the center of circles and angles, or making 90o angles? Here are two online games to try.

The Circle Drawing Experiment allows you to draw circles and then gives you a score based on how well the relationship between perimeter and area of your circle matches a perfect circle. And, it includes cute cat pictures! Hint: larger circles give better scores.


The Eyeballing Game asks you to use your “eyeballing” skills to make parallelograms, find midpoints of lines, bisect angles, and more.

Screen Shot 2013-06-17 at 3.07.25 PM

Just be careful! These games can be addictive!

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