Skip to Main Content
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
you are here 4 61
similarity and congruence
The two mountain triangles
are the same shape, but
rescaled/flipped
6060
37.5
30
40
48
40
6
60
41º 53º
Circle the triangles below that you can be SURE are similar to the triangle repeated
in the design.
To use similarity, you
need to be able to spot it
You won’t normally get instructions that
actually tell you that shapes are similar. So
in order to use similarity, first you need to
be able to be certain that shapes are similar.
You can do that by looking for matching sets
of angles.
The designer’s notes told
us the shapes were similar.
53
o
86
o
53
o
41
o
86
o
53
o
53
o
41
o
86
o
41
o
86
o
41
o
Mountain
tip triangle
is the same
shape
triangle as
the whole
mountain
Become an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
and much more.
Start your free trial

You might also like

Make: Geometry

Make: Geometry

Joan Horvath, Rich Cameron
Classical Geometry: Euclidean, Transformational, Inversive, and Projective

Classical Geometry: Euclidean, Transformational, Inversive, and Projective

I. E. Leonard, J. E. Lewis, A. C. F. Liu, G. W. Tokarsky

Publisher Resources

ISBN: 9780596808365Errata Page