0 votes 0 votes "A planar graph need not to be connected" Can someone plz explain with an example . Set Theory & Algebra gra graph-theory + – Pawan Kumar 2 asked Sep 20, 2017 Pawan Kumar 2 229 views answer comment Share Follow See all 2 Comments See all 2 2 Comments reply Habibkhan commented Sep 20, 2017 reply Follow Share First of all u should know what is a planar graph..For a graph to be planar , no two edges should cross with each other..The same can be met with disconnected graph as well.. Draw two rectangles side by side and now assuming they are part of same graph , hence they are disconnected but no 2 edges are crossing and hence planar.. 3 votes 3 votes Pawan Kumar 2 commented Sep 21, 2017 reply Follow Share thank you very much Sir :) 0 votes 0 votes Please log in or register to add a comment.