9-1 Additional Practice Polygons in the Coordinate Plane Use the figure shown for Exercises 1-4. 1. Is line t parallel to line s? 2. Is line p parallel to line r? 3. Which lines are perpendicular to line t? 4. Which lines are perpendicular to line s? 5. What is the length of overline AB ? 6 7. What is the midpoint of overline AB ? Use the figure shown for Exercises 9-12. 9. Is △ ABC a right triangle? Explain.
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