The demo project shows how to draw a circle using Pen blocks. Make sure you
understand how that works. The main thing you need to be aware of is that a
full rotation is accomplished when the number of repeats multiplied by the
angle within the repeat block equals 360 degrees. To make a rainbow you will
be creating arcs or half circles.
There are seven colors in a standard rainbow and they are red, orange,
yellow, green, blue, indigo, and violet. ROYGBIV is an acronym used to help
people remember these colors. A couple mnemonics exist to help recall these
colors, but you can look those up yourself if you are sufficiently
interested. At any rate, getting back to the assignment, your job is to
create a rainbow using Pen blocks. The left side of your rainbow should be
at (-140,0) and the right side of your rainbow should be at (140,0). There
should be no gaps between the seven colors of the rainbow.