Skip to Main Content
Head First 2D Geometry
book

Head First 2D Geometry

by Stray (Lindsey Fallow), Dawn Griffiths
November 2009
Beginner content levelBeginner
368 pages
8h 55m
English
O'Reilly Media, Inc.
Content preview from Head First 2D Geometry
148 Chapter 3
your geometry toolbox
Your Geometry Toolbox
You’ve got Chapter 3 under
your belt and now you’ve
added the Pythagorean
Theorem to your tool box. For a
complete list of tooltips in the book,
head over to www.headfirstlabs.com/
geometry.
The Pythagorean Theorem
a² + b² = c²
c
a
b
Super Triangles
(Also known as Pythagorean
triples)
3 - 4 - 5
5 - 12 - 13
7 - 24 - 25
8 - 15 - 17
The altitude of an isoceles
triangle splits it into two
congruent right triangles.
If a² + b² < c², then the triangle
is obtuse.
c
a
b
If a² + b² > c², then the triangle
is acute.
c
a
b
CHAPTER 3
Become an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
and much more.
Start your free trial

You might also like

Make: Geometry

Make: Geometry

Joan Horvath, Rich Cameron
Classical Geometry: Euclidean, Transformational, Inversive, and Projective

Classical Geometry: Euclidean, Transformational, Inversive, and Projective

I. E. Leonard, J. E. Lewis, A. C. F. Liu, G. W. Tokarsky

Publisher Resources

ISBN: 9780596808365Errata Page