This lesson plan describes an inquiry-based learning activity about properties of triangles conducted with 8th grade mathematics students. The teacher helps students develop questioning skills by encouraging them to ask questions about a problem presented regarding properties of triangles in a diagram. Students work through a Socratic dialogue with the teacher to analyze the diagram, identify different types of triangles, and deduce that properties of triangles in the diagram imply properties of the original triangle. The lesson concludes with students explaining how they determined properties of the original triangle through questioning and analysis of the diagram.