Start with the outer rectangle perimeter 2(18+11) = 58 m. The step adds two extra 2 m edges, so total = 62 m. For perimeter, trace only the outside boundary once; inner or hidden lines are not counted unless they form part of the edge. For an L-shaped or stepped figure, perimeter follows the outside edge only. Start with the outer rectangle if helpful, then add any extra exposed step edges, and keep the answer as a length unit.