November 2009
Beginner
368 pages
8h 55m
English
Content preview from Head First 2D Geometry
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108 Chapter 3
testing with accurate construction
A sharp pencil
A centimeter ruler,
ideally one with
millimeter markings
as well
A scale
You can use accurate construction to
test ramp designs on paper
Accurate construction is different from making a sketch.
You’ll need:
Scale: 1cm = 1 Kwik-klik unit
ACCURATE CONSTRUCTION
Your eyes
Grid paper in
increments of
centimeters
you are here 4 109
the pythagorean theorem
Hello? Didn’t you spend
chapters 1 & 2 going on
about how we couldn’t trust
a drawing, couldn’t just
measure it, blah, blah, blah?
True. But making an accurate
construction is different.
How is making your own accurate drawing different from just
measuring a sketch or diagram you’re given? Write out your
answer in words below.
your drawing is accurate
110 Chapter 3
How is making your own accurate drawing different from just
measuring a sketch or diagram you’re given?
Right, so if we
know we’ve kept to the same
scale—like using a line exactly
3cm long for a size 3 Kwik-klik
piece—we can use drawing to kind
of simulate the ramp?
Yup. If you can’t draw it with a right
angle, then you can’t build it with a
right angle, either!
Centimeter grid paper has horizontal and vertical
lines which ...
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