Question: 1. Compute the thickness of K3,3.
2. Compute the thickness of the Petersen graph.
3. Give an example of a 4-regular planar graph and an example of a 4-regular non planar graph.
4. Prove that the graph shown in Figure is non-planar.
![385_24.jpg](https://secure.tutorsglobe.com/CMSImages/385_24.jpg)
5. Compute the thickness of K4,4.