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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
Tuesday
Jan 5  Jun 15 
7:30  9:00
PM ET
Jan 5  Jun 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 
Martha Maria Bernal Guillen 
$595
$656 w/books

$595
FULL
With Books $656

Thursday
Jan 21  Jul 1 
7:30  9:00
PM ET
Jan 21  Jul 1
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 
Jon Joseph 
$595
$656 w/books

$595
ENROLL
With Books $656
3 spots left 
Sunday
Jan 24  Jul 18 
7:30  9:00
PM ET
Jan 24  Jul 18
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 
Dan Kneezel 
$595
$656 w/books

$595
ENROLL
With Books $656

Friday
Feb 5  Jul 16 
7:30  9:00
PM ET
Feb 5  Jul 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 
$595
$656 w/books

$595
ENROLL
With Books $656

Monday
Feb 8  Aug 2 
7:30  9:00
PM ET
Feb 8  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 
Jeffrey Hankins 
$595
$656 w/books

$595
ENROLL
With Books $656

Wednesday
Feb 24  Aug 4 
7:30  9:00
PM ET
Feb 24  Aug 4
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 
Patrick Barringer 
$595
$656 w/books

$595
ENROLL
With Books $656

Thursday
Mar 18  Aug 26 
7:30  9:00
PM ET
Mar 18  Aug 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 
Patrick Barringer 
$595
$656 w/books

$595
ENROLL
With Books $656

Sunday
Apr 4  Oct 3 
7:30  9:00
PM ET
Apr 4  Oct 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 
Heather Finotti 
$595
$656 w/books

$595
ENROLL
With Books $656

Monday
Apr 19  Oct 18 
7:30  9:00
PM ET
Apr 19  Oct 18
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 
$595
$656 w/books

$595
ENROLL
With Books $656

Friday
Apr 30  Oct 8 
7:30  9:00
PM ET
Apr 30  Oct 8
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 
$595
$656 w/books

$595
ENROLL
With Books $656

Summer 2021  This course will be offered in Summer 2021. Click here to join our mailing list to be notified when the course schedule is available. 
AoPS Holidays
There are no classes May 29–31, July 3–5, and September 4–6.
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.
