Some notes on **Exercise 4.7** are in order. We do expect you to
be able to prove that the length of the C-curve is determined by the
pattern. One way to do this is to determine a formula
`L(d,n)` for the length of a level-`n` C-curve
between two points distance `d` apart. You can then use
induction to prove that your formula is correct.

One technical tip: if you can't see a fractal with fine details clearly
because it is too small, you can enlarge the image in Scheme by using the
`resize-image`

procedure, which is built-in to our
Scheme. For example, `(resize-image (line 0 0 1 1) 500)`

would give you an image of a line from the center of the image to the
upper-right corner, but it would be much larger than usual.

Rather than typing in the definition of `c-curve`

, you can
click on the following file in Netscape and save it somewhere in your
home directory.

~mc27/labs/fractal-curves/c-curve.scm