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Head First 2D Geometry by Dawn Griffiths, Stray

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CHAPTER 5
your geometry toolbox
Your Geometry Toolbox
You’ve got Chapter 5 under
your belt and now you’ve
added properties of triangles
to your toolbox. For a complete list
of tool tips in the book, head over to
www.headfirstlabs.com/geometry.
Ar
ea =
r
2
Circumf
er
enc
e
=
∏D
= 2
r
Sec
t
or ar
ea =
r
2
x
Sector angle
360
R
adius =
diameter
2
Arc length =
2
r x
Sector angle
360
234 Chapter 5

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