make your problem smaller
But calculating the
corner angles of squares and
equilateral triangles is the easy
part! How’s congruence going
to help with all those angles
between the arrows? Huh?
For starters, congruence means you
only have to do one third of the work.
Those overlap angles are much trickier, but you’ll only
have to find each one once—then you can just copy it
to each of the angles congruent with it.
Look how much of
the problem just
82 Chapter 2