This document provides an overview of key concepts in plane geometry covered in Chapter 5, including points, lines, planes, angles, parallel and perpendicular lines, triangles, polygons, coordinate geometry, congruence, transformations, and tessellations. Specific topics discussed include classifying angles, properties of parallel lines cut by a transversal, the triangle sum theorem, types of triangles and polygons, finding total angle measures of polygons, and using coordinate geometry. Homework problems are provided at the end of sections for additional practice.

1. Chapter 5 – Plane Geometry 5-1 Points, Lines, Planes, and Angles 5-2 Parallel and Perpendicular Lines 5-3 Triangles 5-4 Polygons 5-5 Coordinate Geometry 5-6 Congruence 5-7 Transformations 5-8 Symmetry 5-9 Tessellations

3. Point

4. Line

5. Segment

6. Ray

9. Right Angle

10. Acute Angle

11. Obtuse Angle

12. Complementary Angle

13. Supplementary Angle

18. Parallel Lines

19. Perpendicular Lines

20. Transversal

23. Alternate Interior Angles

24. Alternate Exterior Angles

25. Corresponding Angles

39. Remember…they are ALL triangles

52. This chart may help… n 8 7 6 5 4 3 # of Sides n ° n-gon 1080 ° Octagon 900 ° Heptagon 720 ° Hexagon 540 ° Pentagon 360 ° Quadrilateral 180 ° Triangle Total Angle measure Polygon