# CCSS High School: Geometry (Circles)

- Author:
- JohnCMorris, Tim Brzezinski

**This GeoGebra Book contains lots of discovery-based learning activities, investigations, and meaningful remediation worksheets that were designed to help enhance students' learning of geometry concepts both inside and outside of the mathematics classroom. This GeoGebra Book also contains contributions from from Dr. Ted Coe (https://www.geogebra.org/tedcoe)**

## Table of Contents

### HSG.C.A.1

### HSG.C.A.2

- Circle Terminology
- Circle Tangent-Types Illustrator
- Properties of Tangents Drawn to Circles (A)
- Properties of Tangents Drawn to Circles (B)
- Animation 3
- Tangents to Circles: Investigation
- Where to Sit? (I)
- Where to Sit (II)?
- Inscribed Angle Theorem (V1)
- Animation 12
- Inscribed Angle Theorem: Take 2!
- Inscribed Angle Theorems: Take 3!
- Proof Exercise: Inscribed Angle Theorem (Case 1)
- Proof Exercise: Inscribed Angle Theorem (Case 2)
- Proof Exercise: Inscribed Angle Theorem (Case 3)
- Inscribed Angle Theorems: Take 4!
- Inscribed Angle Theorem: Corollary 1
- Animation 20 (Inscribed Angle Dance!)
- Thales' Theorem (VA)
- Animation 116
- Thales' Theorem (VB)
- Animation 54
- Angle Formed by Chord & Tangent (I)
- Animation 50
- Angle Formed by Chord & Tangent (II)
- Animation 78
- Congruent Chords: Quick Investigation
- Congruent Chords (I)
- Animation 76
- Diameters & Chords I (VA)
- Diameters & Chords I (VB)
- Animation 24
- Congruent Chords Action (A)
- Animation 96
- Equidistant Chord Action
- Animation 101
- Angle Formed by 2 Chords (I)
- Animation 32
- Angle Formed by 2 Chords (II)
- Animation 33
- Angles from Secants and Tangents (V1)
- Animation 61
- Angle From 2 Secants (V2)
- Animation 45
- Crossing Chords: Proof Hint
- Animation 79
- Crossing Chords Property & Proof Start
- Crossing Chords Property & Proof Start (II)
- Secants: Proof Hint
- Animation 88
- Animation 92

### HSG.C.A.3

### HSG.C.A.4

### HSG.C.B.5

### Links to Other CCSS High School: Geometry Standards

### Additional - Links to CCSS High School: Functions Resources