# CK-12 Texas Instruments Geometry Teacher's Edition

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

- 1.
## TE Introduction to Geometry - TI

A brief overview of the following lessons.

- 2.
## TE Basics of Geometry - TI

This chapter includes activities that allow students to explore distances, midpoints, and angle pairs in the coordinate plane.

- 3.
## TE Reasoning and Proof - TI

This chapter tasks students with examining conditional statements in order to derive logical statements through inductive and deductive reasoning.

- 4.
## TE Parallel and Perpendiculuar Lines - TI

This chapter explores the properties of angles and slopes formed by parallel and perpendicular lines, especially when cut by transversals.

- 5.
## TE Congruent Triangles - TI

This chapter focuses on investigating side and angle relationships in congruent triangles as well as making conjectures based on interior and exterior angles. Also covered are the conditions for congruence.

- 6.
## TE Relationships within Triangles - TI

This chapter utilizes exercises that cover the perpendicular bisector theorem, angle bisector theorem, and the median and centroid of a triangle.

- 7.
## TE Quadrilaterals - TI

This chapter explores the properties of various quadrilaterals, including parallelograms, trapezoids, rhombi, and kites.

- 8.
## TE Similarity - TI

This chapter allows students to investigate various methods of constructing similar triangles including utilizing the side-splitter theorem.

- 9.
## TE Right Triangle Trigonometry - TI

This chapter tasks students with proving the Pythagorean theorem using the Cabri Jr. application in addition to covering the properties of special triangles such as the 45-45-90, 30-60-90, and isosceles triangles.

- 10.
## TE Circles - TI

This chapter includes exercises which ask students to deduce corollaries for the perpendicular bisector theorem, discover the inscribed angle theorem, and find the chord-chord, secant-secant, and secant-tangent theorems.

- 11.
## TE Perimeter and Area - TI

This chapter allows students to explore the relationship between a circle’s circumference and its diameter as well as the area of regular polygons in terms of the apothem and the perimeter.

- 12.
## TE Surface Area and Volume - TI

This chapter explores the net representation of a right cylinder, allowing students to develop the surface area from parts of the net.

- 13.
## TE Transformations - TI

This chapter covers transformation concepts such as reflections, rotations, translations, and dilations. Students are also introduced to drawing from both one and two point perspectives.