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 are perfectly perpendicular—making
it extra useful for drawing shapes with right angles
like our ramps need to be. Just try it out.…
If you’re drawing the diagram yourself you can keep it in proportion, and you can get the
angles right, too. You can use a set square or a protractor, or gridded paper, to make
sure lines that are supposed to be perpendicular are drawn at right angles.
If you draw a line 3cm and another line 6cm—measured with a good ruler—you know for
sure that the first line you drew is half the length of the other.
When you’re given a sketch you don’t know whether the person who drew it used a ruler
and protractor to make the drawing accurate, or just did it roughly.
er might be w
t’s OK, it’s
the thought tha