November 2009
Beginner
368 pages
8h 55m
English
Content preview from Head First 2D Geometry
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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?
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