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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
318 Chapter 7
your geometry toolbox
Your Geometry Toolbox
You’ve got Chapter 7 under
your belt and now you’ve
added regular polygons to
your toolbox. For a complete list
of tool tips in the book, head over to
www.headfirstlabs.com/geometry.
CHAPTER 7
Area =
1/2 x Perimeter
x Apothem
Perimeter =
Number of sides
x Side length
Equilateral
triangle area =
3 t
2
4
Circumradius:
radius of the circumcircle
Apothem:
radius of the incircle
The apothem joins the center to the
middle of a side, bisecting it.
The apothem meets the side at a
right angle.
The circumradius joins the center to
a vertex.
The circumradius bisects the
internal angle.
Internal angle =
(n x 180º) - 360º
n
(n is number of sides)
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Publisher Resources

ISBN: 9780596808365Errata Page