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Head First 2D Geometry by Dawn Griffiths, Stray

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a r
ight angle.
W
ha
t Sam pl
anned
t
o build
T
he “upright” is the v
ertica
l part of the ramp.
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.
Perpendicular uprights are Slanted uprights create
perfectly vertical and let the wheel-trapping gaps.
ramps fit together.
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.
Lines or
objects that are
perpendicular
meet or cross at
a right angle.
13
7
12
How the jump
turned out
T
his one isn’t
p
erfec
tl
y v
ertical.
And this angle isn’t
106 Chapter 3
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?
you are here 4 107

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