# Chapter 9: Geometric Figures

**At Grade**Created by: CK-12

## Introduction

In Math 6, the learning content is divided into Concepts. Each Concept is complete and whole providing focused learning on an indicated objective. Theme-based Concepts provide students with experiences that integrate the content of each Concept. Students are given opportunities to practice the skills of each Concept through real-world situations, examples, guided practice and independent practice sections. In this ninth chapter, Geometric Figures, students will engage in many Concepts including information about geometric figures, including geometry, angles, triangles, quadrilaterals, polygons, congruent and similar figures, line symmetry, and problem solving using a Venn diagram.

- 9.1.
## Basic Geometric Definitions

- 9.2.
## Intersecting and Parallel Lines

- 9.3.
## Identification of Angles by Vertex and Ray

- 9.4.
## Angle Measurement

- 9.5.
## Angle Classification

- 9.6.
## Supplementary and Complementary Angle Pairs

- 9.7.
## Triangle Classification by Angles

- 9.8.
## Triangle Classification by Side Lengths

- 9.9.
## Angle Measures in Given Triangles

- 9.10.
## Quadrilateral Classification

- 9.11.
## Angle Measures in Given Quadrilaterals

- 9.12.
## Polygon Classification

- 9.13.
## Regular and Irregular Polygons

- 9.14.
## Relation of Polygon Sides to Angles and Diagonals

- 9.15.
## Triangle Identification as Similar, Congruent, or Neither

- 9.16.
## Corresponding Parts of Congruent Figures

- 9.17.
## Corresponding Parts of Similar Figures

- 9.18.
## Unknown Measures of Similar Figures

- 9.19.
## Indirect Measurement

- 9.20.
## Lines of Symmetry

- 9.21.
## Number Patterns

- 9.22.
## Venn Diagrams

### Chapter Summary

## Summary

Having completed this chapter, students are now ready to move on to Chapter Ten. Each Concept has provided students with an opportunity to engage and practice skills in many Concepts including information about geometric figures, including geometry, angles, triangles, quadrilaterals, polygons, congruent and similar figures, line symmetry, and problem solving using a Venn diagram.