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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? SYLLABUS

Schedule

Wednesday Aug 26 - Feb 24	7:30 - 9:00 PM ET Aug 26 - Feb 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	$570 $631 w/books	$570 With Books $631 CLOSED
Thursday Aug 27 - Feb 25	7:30 - 9:00 PM ET Aug 27 - Feb 25 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	$570 $631 w/books	$570 With Books $631 CLOSED
Tuesday Sep 8 - Mar 9	7:30 - 9:00 PM ET Sep 8 - Mar 9 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
Monday Sep 14 - Mar 15	7:30 - 9:00 PM ET Sep 14 - 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	Kevin Arlin	$570 $631 w/books	$570 With Books $631 ENROLL
Friday Sep 25 - Mar 26	7:30 - 9:00 PM ET Sep 25 - Mar 26 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	$570 $631 w/books	$570 With Books $631 ENROLL
Sunday Sep 27 - Mar 28	7:30 - 9:00 PM ET Sep 27 - Mar 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	Heather Finotti	$570 $631 w/books	$570 With Books $631 ENROLL
Monday Oct 26 - Apr 26	7:30 - 9:00 PM ET Oct 26 - Apr 26 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	Martha Maria Bernal Guillen	$570 $631 w/books	$570 With Books $631 ENROLL
Wednesday Nov 11 - May 12	7:30 - 9:00 PM ET Nov 11 - May 12 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	Radu Andrei Cebanu	$570 $631 w/books	$570 With Books $631 ENROLL
Thursday Dec 10 - Jun 3	7:30 - 9:00 PM ET Dec 10 - Jun 3 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	TBA	$570 $631 w/books	$570 With Books $631 ENROLL
Spring 2021	This course will be offered in Spring 2021. Click here to join our mailing list to be notified when the course schedule is available.

AoPS Holidays

There are no classes October 31, November 23–29, and December 21–January 3.

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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