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Introduction to Geometry Fundamentals of geometry, including angles, triangle similarity and congruence, complicated area problems, mastering the triangle, special quadrilaterals, polygons, the art of angle chasing, power of a point, 3-dimensional geometry, transformations, analytic geometry, basic trigonometry, geometric proof, and more. Required Text: Introduction to Geometry	24 weeks Diagnostics ARE YOU READY? DO YOU NEED THIS? Documents SYLLABUS
24 weeks ARE YOU READY? DO YOU NEED THIS?

Schedule

Friday Sep 13 - Mar 13	7:30 - 9:00 PM ET Sep 13 - Mar 13 7:30 - 9:00 PM Eastern 6:30 - 8:00 PM Central 5:30 - 7:00 PM Mountain 4:30 - 6:00 PM Pacific Click here to see more time zones	Wendy Hou	$545 $606 w/books	$545 With Books $606 CLOSED
Sunday Sep 15 - Mar 15	7:30 - 9:00 PM ET Sep 15 - Mar 15 7:30 - 9:00 PM Eastern 6:30 - 8:00 PM Central 5:30 - 7:00 PM Mountain 4:30 - 6:00 PM Pacific Click here to see more time zones	Christian Hokaj	$545 $606 w/books	$545 With Books $606 CLOSED
Tuesday Sep 24 - Mar 24	7:30 - 9:00 PM ET Sep 24 - Mar 24 7:30 - 9:00 PM Eastern 6:30 - 8:00 PM Central 5:30 - 7:00 PM Mountain 4:30 - 6:00 PM Pacific Click here to see more time zones	Achilleas Sinefakopoulos	$545 $606 w/books	$545 With Books $606 CLOSED
Monday Oct 7 - Apr 6	7:30 - 9:00 PM ET Oct 7 - Apr 6 7:30 - 9:00 PM Eastern 6:30 - 8:00 PM Central 5:30 - 7:00 PM Mountain 4:30 - 6:00 PM Pacific Click here to see more time zones	Jeffrey Hankins	$545 $606 w/books	$545 With Books $606 CLOSED
Wednesday Nov 13 - May 13	7:30 - 9:00 PM ET Nov 13 - May 13 7:30 - 9:00 PM Eastern 6:30 - 8:00 PM Central 5:30 - 7:00 PM Mountain 4:30 - 6:00 PM Pacific Click here to see more time zones	Jeffrey Hankins	$545 $606 w/books	$545 With Books $606 CLOSED
Thursday Dec 5 - May 28	7:30 - 9:00 PM ET Dec 5 - May 28 7:30 - 9:00 PM Eastern 6:30 - 8:00 PM Central 5:30 - 7:00 PM Mountain 4:30 - 6:00 PM Pacific Click here to see more time zones	Xinke Guo-Xue	$545 $606 w/books	$545 With Books $606 ENROLL
Tuesday Jan 7 - Jun 16	7:30 - 9:00 PM ET Jan 7 - Jun 16 7:30 - 9:00 PM Eastern 6:30 - 8:00 PM Central 5:30 - 7:00 PM Mountain 4:30 - 6:00 PM Pacific Click here to see more time zones	Christian Hokaj	$570 $631 w/books	$570 With Books $631 ENROLL
Thursday Jan 23 - Jul 2	7:30 - 9:00 PM ET Jan 23 - Jul 2 7:30 - 9:00 PM Eastern 6:30 - 8:00 PM Central 5:30 - 7:00 PM Mountain 4:30 - 6:00 PM Pacific Click here to see more time zones	Jeffrey Hankins	$570 $631 w/books	$570 With Books $631 ENROLL
Sunday Feb 9 - Aug 2	7:30 - 9:00 PM ET Feb 9 - Aug 2 7:30 - 9:00 PM Eastern 6:30 - 8:00 PM Central 5:30 - 7:00 PM Mountain 4:30 - 6:00 PM Pacific Click here to see more time zones	Miles Dillon Edwards	$570 $631 w/books	$570 With Books $631 ENROLL
Friday Feb 28 - Aug 14	7:30 - 9:00 PM ET Feb 28 - Aug 14 7:30 - 9:00 PM Eastern 6:30 - 8:00 PM Central 5:30 - 7:00 PM Mountain 4:30 - 6:00 PM Pacific Click here to see more time zones	Marcus Neal	$570 $631 w/books	$570 With Books $631 ENROLL
Wednesday Mar 11 - Aug 19	7:30 - 9:00 PM ET Mar 11 - Aug 19 7:30 - 9:00 PM Eastern 6:30 - 8:00 PM Central 5:30 - 7:00 PM Mountain 4:30 - 6:00 PM Pacific Click here to see more time zones	Achilleas Sinefakopoulos	$570 $631 w/books	$570 With Books $631 ENROLL
Monday Apr 13 - Oct 5	7:30 - 9:00 PM ET Apr 13 - Oct 5 7:30 - 9:00 PM Eastern 6:30 - 8:00 PM Central 5:30 - 7:00 PM Mountain 4:30 - 6:00 PM Pacific Click here to see more time zones	Jeffrey Hankins	$570 $631 w/books	$570 With Books $631 ENROLL
Wednesday Apr 29 - Oct 7	7:30 - 9:00 PM ET Apr 29 - Oct 7 7:30 - 9:00 PM Eastern 6:30 - 8:00 PM Central 5:30 - 7:00 PM Mountain 4:30 - 6:00 PM Pacific Click here to see more time zones	Joshua Zucker	$570 $631 w/books	$570 With Books $631 ENROLL
Summer 2020	This course will be offered in Summer 2020. Click here to join our mailing list to be notified when the course schedule is available.

AoPS Holidays

There are no classes December 21–January 3, May 23–25, July 3–5, and September 5–7.

Who Should Take?

This is the most challenging of our Introduction series of classes. We recommend that students complete our Introduction to Algebra B course, or are able to pass the Introduction to Algebra B post-test, prior to taking Introduction to Geometry.

Lessons

Lesson 1	Angles
Lesson 2	Triangle Angles and Congruent Triangles
Lesson 3	Isosceles & Equilateral Triangles, Perimeter, and Area
Lesson 4	Similar Triangles
Lesson 5	Similar Triangles and Right Triangles
Lesson 6	More Right Triangles!
Lesson 7	Special Parts of a Triangle
Lesson 8	Special Parts of a Triangle, Continued!
Lesson 9	Quadrilaterals
Lesson 10	More Quadrilaterals
Lesson 11	Polygons
Lesson 12	Geometric Inequalities
Lesson 13	Introduction to Circles
Lesson 14	Circles and Angles
Lesson 15	Tangents
Lesson 16	Power of a Point
Lesson 17	3D Geometry Part 1
Lesson 18	3D Geometry Part 2
Lesson 19	Transformations
Lesson 20	Analytic Geometry
Lesson 21	More Analytic Geometry
Lesson 22	Basic Trigonometry
Lesson 23	Problems!
Lesson 24	More Problems!

Required Textbook

Introduction to Geometry

By Richard Rusczyk

A full course in challenging geometry for students in grades 7-10, including topics such as similar triangles, congruent triangles, quadrilaterals, polygons, circles, funky areas, power of a point, three-dimensional geometry, transformations, introductory trigonometry, and more.

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