Topic Classification: nid, "Topic Classification"); ?>  Tags: nid, "Problem Tag");?>  
Grade Vs Difficulty:

This lesson is a followup to the well known rational tangle lesson plan.
Help! My little sibling crunched my knots.
The first crunched knotted loop is on the left. I was able to restore the loop to its symmetric form without breaking the loop. The restored version is on the right.
Notice that the restored version has 1/2 rotational symmetries through three perpendicular axes. Can you help me restore my second loop into a nice symmetrical figure without breaking it? It is shown below:
Try to make symmetric pictures of other knots. Draw random curves with 3  11 crossings
and see what you can find. You can find a list of knots at
Knot Table
Hint: Does the simplest rational tangle have any symmetry? What happens when one is rotated? What happens when one is twisted?