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Introduction to GeometryFundamentals 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, 3dimensional geometry, transformations, analytic geometry, basic trigonometry, geometric proof, and more. 
24 weeks 
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
CLOSED
With Books $631

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
CLOSED
With Books $631

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
CLOSED
With Books $631

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
ENROLL
With Books $631

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 GuoXue 
$570
$631 w/books

$570
ENROLL
With Books $631

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
ENROLL
With Books $631

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
ENROLL
With Books $631

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
ENROLL
With Books $631

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
ENROLL
With Books $631

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 posttest, 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
A full course in challenging geometry for students in grades 710, including topics such as similar
triangles, congruent triangles, quadrilaterals, polygons, circles, funky
areas, power of a point, threedimensional geometry, transformations, introductory trigonometry, and
more.
