Planar graph proof [duplicate]

I need to prove some graph problem.

let G be planar graph with more than 10 vertices

i need to prove the Complement graph G' is not planar.

thanks in advance and sorry for my horrible english.

-
–  Paul Sep 26 '12 at 12:13
Thanks, It's exacly the same :D –  Some1Pr0 Sep 26 '12 at 12:38

marked as duplicate by Paul, Douglas S. Stones, draks ..., Chris Eagle, MJDSep 27 '12 at 6:20

Hint: Try to show that $G'$ contains a full subgraph of 5 vertices $K_5$ or the full bipartite graph $K_{3,3}$.