Course Description

Geometry is a proof-based, high school level geometry course that emphasizes geometric concepts in two and three dimensions as they apply to points, lines, planes, circles, and polygons. This course is suitable for students who have completed an Algebra 1 course or equivalent, and after successful completion of Geometry, students are prepared to move onto Algebra 2.

Geometry A covers five broad topics: geometry foundations, lines and angles, triangles, triangle dissection, and trigonometry. The practice problems provided in this course range from fundamentals practice to complex proof-based problems with concepts that would be helpful for example, to draw a blueprint for something as small as a product or as big as a home.

Who's this course for

Age 13-16

Prerequisites

Algebra 1

This course typically takes 4-7 months to complete. This depends on the student's dedication to homework, their previous experience, and the difficulty of course material. Our instructors move at the pace of the student, taking extra time to reinforce concepts as needed.


  • Course modules


  • Geometry Foundations

    GEOA1 Definitions and Notation

    GEOA2 Logical Reasoning

    GEOA3 Proofs


  • Lines and Angles

    GEOA5 Parallel and Perpendicular Lines

    GEOA6 Proving Parallel and Perpendicular Lines


  • Introduction to Triangles

    GEOA7 Classifying Triangles

    GEOA8 Triangle Congruence

    GEOA9 Triangle Similarity

    GEOA10 Right Triangles


  • Triangle Dissection

    GEOA11 Bisectors

    GEOA12 Medians and Altitudes

    GEOA13 Inequalities with Triangles


  • Trigonometry

    GEOA14 Basic Trigonometry

Geometry is one of the most rewarding classes I teach because it really encourages students to lead their own exploration through the math curriculum.

One time I worked with a fairly shy student on Geometry. That all changed after they completed their first few proofs. It seemed like learning how to officially "prove" concepts empowered them to ask deeper questions and follow their curiosity.

Obie K., Juni instructor

Washington University in St. Louis

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