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Head First 2D Geometry by Dawn Griffiths, Stray

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Sup
er T
r
iangles
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.
T
he Pythagor
ean Theor
em
a² +
=
c
a
b
(Also known as Pythagor
ean
tr
iples)
3 - 4 - 5
5 - 12 - 13
7 - 24 - 25
8 - 15 - 17
The a
lti
tude of an isoc
eles
tr
iangle splits i
t int
o t
wo
congruent right triangles.
If a² + b² < c², then the tr
iangle
is obtuse.
c
a
b
If a² + b² > c², then the tr
iangle
is acute.
c
a
b
148 Chapter 3

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