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
106 Chapter 3
perpendicular lines create right angles
The ramps must have
perpendicular uprights
Sam needs the ramps to have true vertical uprights, perpendicular
(90º) to the bases, so that she can put them back to back or against a
wall without a nasty gap to get your wheels caught in.
Lines or
objects that are
perpendicular
meet or cross at
a right angle.
Perpendicular uprights are
perfectly vertical and let the
ramps fit together.
Slanted uprights create
wheel-trapping gaps.
But Sam’s first prototype is not squaring up
Even though it looked good on paper, now Sam’s built her
first ramp and…well, it’s just plain wonky.
How the jump
turned out
This one isn’t
perfectly vertical.
And this angle isn’t
a right angle.
What Sam planned
to build
The “upright” is the vertical part of the ramp.
13
7
12
you are here 4 107
the pythagorean theorem
Wow, I guess it’s important
which lengths I put
together! It would be cool to
know that the ramp will work
out straight BEFORE we buy
parts and build it....
Could you use a pencil, a ruler and some paper to
check out whether a ramp design will give you a
perfectly vertical upright before you build it?
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