Geometry Online Course - Summer Edition

$125.00 was $159.00

This course includes:
20+ hours of video instruction Auto-graded exercises & tests
Downloadable notes & worksheets 3 months unlimited access
Access on mobile Certificate of completion
Optional course additions (check box to select):
Companion Book, Volume 1 $44.99 View details
Companion Book, Volume 2 $44.99 View details
Companion Book Answer Key $21.95 View details
Live office hours/ tutoring support $34.95 a month View details

Welcome to our dynamic online Geometry summer course, where we compress a full year's worth of geometric exploration into an exhilarating 8-week journey! Get ready to immerse yourself in the captivating world of shapes, angles, and spatial reasoning like never before. Check out the summer course lesson plan.

In this accelerated course, students will embark on a comprehensive exploration of Geometry, typically spread across an entire academic year. Students learn through engaging video lessons, interactive exercises, diagnostic tests, and optional personalized support from instructors. Purchase the printed companion books (view sample) for an easy-to-use, pencil-to-paper complement to the online experience.

By the end of this intensive summer course, students will have not only covered the entire Geometry curriculum but also developed a strong foundation in spatial reasoning and geometric problem-solving skills. Join us for an unforgettable summer of geometric exploration and academic achievement! For an overview of the course, check out the video below.

Course Features

Video Lessons

244 Engaging 5–7 minute Geometry lesson videos
View Sample

Lesson Plan

Accelerated 8-week lesson plan
View Lesson Plan


Automatically graded exercises and tests
View Sample

Notes & Worksheets

Illustrated course notes, worksheets & answer keys
View Sample
What Parents Are Saying...
"I love Thinkwell math! My son and I think Professor Burger is awesome. We tried a few different math programs but nothing compares to Thinkwell. The concepts are presented in a way that makes them so much easier to understand. I go through the lectures and problems with my son most of the time and I am finally learning Geometry (my nemesis in high school and college). Professor Burger uses humor which makes it even better. We will definitely continue to use Thinkwell. I am so grateful to have found it!"
– Tina C
"We are using Thinkwell's Geometry, and we love it. The lectures are fun and well organized. The notes for each lesson are easy to follow and provide all the info needed to complete the problems. My son is excelling with this program, and I find it very easy to jump in and help him when needed!”
– Virginia
"We didn't start homeschooling until last year, my daughter's freshman year. I used a different math program that had come highly recommended and it was like pulling teeth to get my daughter to do her work. She said it was too confusing. This year we started with Thinkwell's Geometry and my daughter loves it. She can't believe how much better it is to understand. Now her math is done every day without being promoted. No more tears, no more fighting. Thank you, Thinkwell!”
– Teresa R.
Course Overview

What You Get

  • 3-month, online subscription to our complete Geometry course
  • 8-week course lesson plan
  • 80+ course lessons with 240+ streaming videos
  • Automatically graded drill-and-practice exercises with step-by-step answer feedback
  • Downloadable, printable course worksheets & answer keys
  • Illustrated course study notes
  • Chapter & Practice tests, a Midterm & Final Exam
  • Animated interactivities....and more!
  • Free Course Companion E-Books

How It Works

  • Purchase Thinkwell's Geometry through our online store
  • Create an account username and password which will give you access to the online Geometry course section
  • Activate your 3-month subscription when you're ready
  • Login to the course website to access the online course materials, including streaming video lessons, exercises, tests, and more
  • Access your course anytime, anywhere, from any device
  • Your work is automatically tracked and updated in real-time
  • Grade reports and certificates of completion are available upon request
About Thinkwell's Geometry Author

Learn from award-winning mathematician Dr. Edward Burger

It's like having a world-class college professor right by your side.

  • "Global Hero in Education" by Microsoft Corporation
  • "America's Best Math Teacher" by Reader's Digest
  • Robert Foster Cherry Award Winner for Great Teaching
  • Author of The 5 Elements of Effective Thinking and Making Up Your Own Mind: Thinking Effectively Through Creative Problem Solving
  • A leader on thinking, innovation, and creativity
Thinkwell's Geometry –Summer Edition– Table of Contents
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Week 1 - Chapters 1 Fundamentals of Geometry & 2 Reasoning and Writing Geometric Proofs

1.1 Points, Lines, Planes, and Angles
1.1.1 Understanding Points, Lines, and Planes
1.1.2 Measuring and Constructing Segments
1.1.3 Measuring and Constructing Angles
1.1.4 Pairs of Angles
1.2 Coordinate and Transformation Tools
1.2.1 Using Formulas in Geometry
1.2.2 Midpoint and Distance in the Coordinate Plane
1.2.3 Transformations in the Coordinate Plane

2. Reasoning and Writing Geometric Proofs
2.1 Inductive and Deductive Reasoning
2.1.1 Using Inductive Reasoning to Make Conjectures
2.1.2 Conditional Statements
2.1.3 Using Deductive Reasoning to Verify Conjectures
2.1.4 Biconditional Statements and Definitions
2.2 Mathematical Proof
2.2.1 Algebraic Proof
2.2.2 Geometric Proof
2.2.3 Flowchart and Paragraph Proofs

Week 2 - Chapter 3 Parallel and Perpendicular Lines

3.1 Lines with Transversals
3.1.1 Planes, Lines, and Angles
3.1.2 Angles, Parallel Lines, and Transversals
3.1.3 Proving that Lines are Parallel
3.1.4 Properties of Perpendicular Lines
3.2 Slope and the Equation of a Line
3.2.1 Finding the Slope Given Two Points
3.2.2 Slope-Intercept Form
3.2.3 Point-Slope Form
3.2.4 Slopes of Parallel and Perpendicular Lines

Week 3 - Chapter 4 Triangle Congruence

4.1 Triangles and Congruence
4.1.1 Classifying Triangles
4.1.2 Angle Relationships in Triangles
4.1.3 Congruent Triangles
4.2 Proving Triangle Congruence
4.2.1 Triangle Congruence: SSS and SAS
4.2.2 Triangle Congruence: ASA, AAS, and HL
4.2.3 Triangle Congruence: CPCTC
4.2.4 Introduction to Coordinate Proof
4.2.5 Isosceles and Equilateral Triangles

Week 4 - Chapter 5 Properties and Attributes of Triangles & Midterm Exam

5.1 Segments in Triangles
5.1.1 Perpendicular and Angle Bisector Theorems
5.1.2 Medians, Altitudes, and Midsegments in Triangles
5.2 Relationships in Triangles
5.2.1 Indirect Proof and Inequalities in One Triangle
5.2.2 Inequalities in Two Triangles
5.2.3 The Pythagorean Theorem
5.2.4 Applying Special Right Triangles

Week 5 - Chapter 6 Polygons and Quadrilaterals

6.1 Polygons and Parallelograms
6.1.1 Properties and Attributes of Polygons
6.1.2 Properties of Parallelograms
6.1.3 Conditions for Parallelograms
6.2 Other Special Quadrilaterals
6.2.1 Properties of Special Parallelograms
6.2.2 Conditions for Special Parallelograms
6.2.3 Properties of Kites and Trapezoids

Week 6 - Chapters 7 Similarity & 8 Right Triangles and Trigonometry

7.1 Similarity Relationships
7.1.1 Ratio and Proportion
7.1.2 Ratios in Similar Polygons
7.1.3 Triangle Similarity: AA, SSS, and SAS

8. Right Triangles and Trigonometry
8.1 Trigonometric Ratios
8.1.1 Similarity in Right Triangles
8.1.2 Trigonometric Ratios
8.1.3 Solving Right Triangles

Week 7 - Chapters 9 Extending Perimeter, Circumference, and Area & 10 Spatial Reasoning

9.1 Developing Geometric Formulas
9.1.1 Developing Formulas for Triangles and Quadrilaterals
9.1.2 Developing Formulas for Circles and Regular Polygons

10. Spatial Reasoning
10.1 Surface Area and Volume
10.1.1 Surface Area of Prisms and Cylinders
10.1.2 Surface Area of Pyramids and Cones
10.1.3 Volume of Prisms and Cylinders

Week 8 - Chapters 11 Circles & 12 Transformational Geometry, & Final Exam

11.1 Lines and Arcs in Circles
11.1.1 Lines That Intersect Circles
11.1.2 Arcs and Chords
11.2 Angles and Segments in Circles
11.2.1 Inscribed Angles
11.2.2 Angle Relationships in Circles
11.2.3 Segment Relationships in Circles

12. Transformational Geometry
12.1 Congruence Transformations
12.1.1 Reflections
12.1.2 Translations
12.1.3 Rotations

13. Appendix: Essential Algebra Review (Optional)

13.1 Solving Equations and Inequalities
13.1.1 Simplifying Expressions
13.1.2 Writing and Solving Two-Step Equations
13.1.3 Solving Two-Step Inequalities
13.1.4 Writing and Solving Multi-Step Equations
13.1.5 Solving Equations with Variables on Both Sides
13.1.6 Systems of Equations
13.2 Graphing and the Coordinate Plane
13.2.1 The Coordinate Plane
13.2.2 Equations, Tables, and Graphs
13.2.3 Graphing Using Intercepts
13.3 Ratio and Proportion
13.3.1 Rates, Ratios, and Proportions
13.3.2 Applications of Proportions
13.3.3 Finding and Using Percents
13.4 Operations with Polynomials and Factoring
13.4.1 Adding and Subtracting Polynomials
13.4.2 Multiplying and Dividing Monomials
13.4.3 Multiplying Monomials by Polynomials
13.4.4 Multiplying Binomials
13.4.5 Factoring with the GCF
13.4.6 Factoring x2 + bx + c
13.4.7 Factoring ax2 + bx + c
13.5 Radicals and Solving Quadratics
13.5.1 Radical Expressions
13.5.2 Solving Quadratic Equations by Factoring
13.5.3 Solving Quadratic Equations by Using Square Roots
Frequently Asked Questions About Thinkwell's Geometry

How do Thinkwell courses work?

Your student watches a 5-10 minute online video lesson and then completes the automatically graded exercises for the topic. You'll get instant correct-answer feedback. Then move on to the next lesson! The courses are self-paced, or you can use the daily lesson plans. Just like a textbook, you can choose where to start and end, or follow the standard table of contents.

When does my subscription start?

It starts when you're ready. You can have instant access to your online subscription when you purchase online, or you can purchase now and start later.

What math courses should a student take?

A typical sequence of secondary math courses completed by a college-bound student is: Grade 6 Math > Grade 7 Math > Grade 8 Math > Algebra 1 > Geometry > Algebra 2 > Precalculus. For students looking to include Calculus as part of their high school curriculum and are able to complete Grade 7 Math in 6th grade, the sequence can be: Grade 7 Math > Prealgebra > Algebra 1 > Geometry > Algebra 2 > Precalculus > Calculus.

Is Thinkwell’s Geometry appropriate for my accelerated student?

For advanced students, check out our Geometry Honors course.

Does my student get school credit for Thinkwell’s Geometry?

No, only schools are accredited and Thinkwell is not a school, though many accredited schools use Thinkwell.

Does Thinkwell's Geometry meet state standards?

Some state sets standards for what topics should be taught in a particular course. Thinkwell does not have a course version for each state. Instead, the course is built to national standards to be inclusive of all states. Websites such as can help you determine your state's standards.

What if my student needs access to the course for more than 3 months?

You can purchase extra time for $19.95/month.

Can I share access with more than one student?

The courses are designed and licensed to accommodate one student per username and password; additional students need to purchase online access. This allows parents to keep track of each student's progress and grades.

How long does it take to complete Thinkwell’s Geometry course?

The pace of your course is up to you. We've broken down the full course into 8-week segments. Do as little or as much as you like in a week. If you're pressed for time, we recommend taking the Chapter Pre-Test first to identify the topics you can skip, and those your student might need to study. See the Pre-Test Guide for the list of topics that correspond to the questions on the Pre-Test.

Can I see my grade?

Thinkwell’s course software tracks everything your student does. When logged in, your student can click "My Grades" to see their progress.

How are grades calculated?

The course grade is based on the scores for the Chapter Tests, Midterm and Final Exams.

What is acceptable performance on the exams?

As a home-school parent, you decide the level of performance you want your student to achieve; the course does not limit access to topics based on performance on prior topics.

Can I get a transcript?

Yes, there's a final grade report print option in the My Grades section. Contact with any questions.

What if I change my mind and want to do a different math course, can I change?

If you discover that you should be in a different course, contact within one week of purchase and we will move you to the appropriate course.

Can I print the exercises?

Yes, but completing the exercises online provides immediate correct answer feedback and automatic scoring, so we recommend answering the exercises online.

Are exercises multiple choice?

Most of the exercises are multiple choice and they are graded automatically with correct answer solutions.

Is Thinkwell's Geometry spiral or mastery-based?

Thinkwell math courses are mastery-based, ensuring students thoroughly grasp each concept before progressing to the next. While mastery is the primary goal, our courses integrate regular review opportunities strategically throughout the course material. These reviews reinforce previously learned material, solidifying understanding and identifying areas for improvement. By combining mastery-focused instruction with ongoing review, Thinkwell Math equips students with a strong foundation in mathematics, setting them up for long-term success in the subject.

What is Thinkwell's Refund Policy?

We offer a full refund of 6-month subscription purchases within 14 days of purchase, no questions asked. However, refunds are not provided for completed courses. No grade reports, certificates, or transcripts are provided for refunded courses. For Essential Review courses, the refund period is 3 days. Optional printed materials are printed on demand and the sales are final.

How does my school review this course?

Should your school need to review a Thinkwell course for any reason, have the school contact and we can provide them access to a demo site.

Do I get credits for a Thinkwell course?

Generally, only schools can award credits, and Thinkwell is not a school. We can provide you with a certificate of completion and a grade report. However, if you’re pursuing credit with a particular school or institution, it might be helpful to know that the full versions of the Thinkwell math courses are accredited by the Western Association of Schools and Colleges (WASC) as a Supplementary Education Program. For California students, Thinkwell is also an approved A-G online publisher. See the Accreditation Page in the bottom menu for more information.

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