1. Focus on Line 1 and Line 2. Use Geogebra to measure the distance between A and C and the between B and D. What do you notice? Are Line 1 and Line 2 parallel, perpendicular, or oblique? 2. Focus on Line 2 and Line 3. Use Geogebra to measure the distance between C and E and between D and F. What do you notice? Are Line 2 and Line 3 parallel, perpendicular, or oblique? 3. Focus on Line 1 and Line 3. Use Geogebra to measure the distance between A and E and between B and F. What do you notice? Are Line 1 and Line 3 parallel, perpendicular, or oblique? 4. Now use the slope setting to find the slopes of all 3 lines. What do you notice? 5. Based on your answers to these questions, write a rule about the slopes of lines that are parallel.

https://docs.google.com/document/d/10YRlRXTJWXU5CGBdSZizHOSlYADTsuttJmorXl8i_S8/edit?usp=sharing