# CCSS High School: Geometry (Similarity, Right T, Trig.)

- Author:
- Aaron Dankman, Tim Brzezinski

- Topic:
- Geometry

Thank you to Tim Brzezinski for his excellent work on dynamic CCSS materials for geometry.

**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 the following individuals: Jennifer Silverman (https://www.geogebra.org/jennifer+silverman) Steve Phelps (https://www.geogebra.org/stevephelps) Dr. Ted Coe (https://www.geogebra.org/tedcoe) Without their amazing talent and creativity, this resource would not have been possible.**## Table of Contents

### HSG.SRT.A.2

### HSG.SRT.A.3

### HSG.SRT.B.4 & B.5

- SAS ~ Theorem
- SSS ~ Theorem (V1)
- Animation 63
- SSS ~ Theorem (V2)
- SSSS: Similar Quads?
- Similar Right Triangles (V1)
- Animation 13
- Pythagorean and similar triangles.
- Effortless Trisections
- Animation 134
- Parallel Lines Congruent Segments Theorem
- Parallel Lines Proportionality Theorem
- Triangle-Angle Bisector Theorem
- Animation 81
- Proof Without Words
- Wordless Pythagorean Theorem based on Translations
- Proof Without Words
- Proof Without Words
- Proof Without Words
- Proof Without Words
- Proof Without Words
- Proof Without Words
- Proof Without Words
- Proof Without Words
- Proof Without Words

### HSG.SRT.C.6 & C.7 & C.8

- Angles in Standard Position
- Animation 176
- Special Angles in Standard Position: Intro (V2)
- Special Angles in Standard Position: Intro (V3)
- Special Angles in Standard Position: Intro (V1)
- Animation 177
- Animation 178
- Right Triangle Trigonometry: Intro
- Discovering Sine, Cosine, and Tangent in Right Triangles
- Trigonometric Ratios (Right Triangle Context)
- What "CO" in COsine Means
- Animation 98
- Animation 99
- Animation 100
- How Fast are You Spinning?

### HSG.SRT.D.9 & D.10 & D.11

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