# Chapter 9: Geometric Figures

Difficulty Level:

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

## Introduction

In this chapter, students will engage with the following concepts: geometry, angles, triangles, quadrilaterals, polygons, congruent and similar figures, line symmetry, and problem solving using a Venn diagram.

Chapter Outline

- 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 Classifications

- 9.6.
## Supplementary and Complementary Angles

- 9.7.
## Triangle Classification by Angles

- 9.8.
## Triangle Classification by Side Lengths

- 9.9.
## Angle Measures in Given Triangles

- 9.10.
## Quadrilateral Classifications

- 9.11.
## Angle Measures in Given Quadrilaterals

- 9.12.
## Polygon Classifications

- 9.13.
## Classifying 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 in Similar Figures

- 9.19.
## Indirect Measurement

- 9.20.
## Line of Symmetry

- 9.21.
## Number Patterns

- 9.22.
## Venn Diagrams

### Chapter Summary

### Image Attributions

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Description

This chapter covers: geometry, angles, triangles, quadrilaterals, polygons, congruent and similar figures, line symmetry, and problem solving using a Venn diagram.

Difficulty Level:

At Grade
Tags:

acute
angle
angle pair
(26 more)
CK.MAT.ENG.SE.1.CK-12-Middle-School-Math-Concepts---Grade-6.9
complementary
congruent
corresponding
diagonal
indirect measurement
intersecting lines
irregular polygon
line
line segment
Line Symmetry
obtuse
Parallel Lines
point
polygon
protractor
quadrilateral
ray
regular polygon
right
similar
straight
supplementary
triangle
Venn diagram
vertex

Subjects:

Grades:

Date Created:

Nov 19, 2014
Last Modified:

Jun 07, 2016
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