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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
20 Chapter 1
triangle corners add up to 180
º
The corner angles of a triangle
always add up to a straight line
67º
78º
35º
10º
105º
65º
110º
32º
38º
50º
75º
55º
Try it with any
shape of triangle—
fat, thin, big, small....
The corner angles of a triangle always make a straight line,
no matter what kind of triangle it is. Angles on a straight
line always add up to 180º, so the corner angles of a
triangle must always add up to 180º, too.
This is true for
every triangle
you could possibly
draw!
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Publisher Resources

ISBN: 9780596808365Errata Page