# Is L(K4) graph planar?

I'm a little confused with L(K4) [Line-Graph]

I had a text where L(K4) is not planar. Today I found this: https://i.stack.imgur.com/8g2na.png

So is L(K4) planar?

Thanks

• Yes - the picture you link to shows that. Perhaps you misread the text. Please edit the question to show us the actual assertion. – Ethan Bolker Nov 29 '18 at 12:57
• Which book do you use? – mathpadawan Nov 29 '18 at 16:13

$$K_4$$ is a graph on $$4$$ vertices and 6 edges. The line graph of $$K_4$$ is a 4-regular graph on 6 vertices as illustrated below: