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O'Reilly Platform
book
Head First 2D Geometry
by
Stray (Lindsey Fallow)
,
Dawn Griffiths
November 2009
Beginner content level
Beginner
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: 9780596808365
Errata Page