1. The problem asks: How many lines are shown in the drawing? 2. A line in geometry is a straight one-dimensional figure having no thickness and extending infinitely in both directions, indicated by arrows at both ends. 3. From the description, there is one horizontal line extending infinitely in both directions (with arrows at both ends). 4. The square is attached to this horizontal line by a vertical line segment from its bottom side to the horizontal line. This vertical segment is a line segment, not a line, because it has endpoints. 5. The square itself consists of four sides, each a line segment, not lines, because they have endpoints. 6. Therefore, the only line (infinite in both directions) described is the horizontal line. Final answer: There is 1 line shown in the drawing.