The fоllоwing imаge is а pаrallelоgram. If you were to draw a diagonal from O to M, then the two resulting triangles are congruent. The parallelogram LMNO is outlined in black. The vertices are labeled counterclockwise: L at the bottom left, M at the bottom right, N at the top right, and O at the top left. The top side, O N, and the bottom side, LM, are horizontal and parallel. The left side OL and right side NM are slanted and lean to the left, making the opposite sides parallel.