Shape

257 Spatial Relations and Rules
there are six spatial relations
and for the equilateral triangle
just one
But there’s no reason for me to stop. I can use my triangles together to get four more
spatial relations
And I can break the symmetry of my triangles to define different rules that apply in
definite ways. Again, points are useful if I put them in the right places—here in the
isosceles triangle
and here in the equilateral one
And, in fact, these triangles with points have spatial relations that correspond to the
ones for my scalene triangle. This is a nice way to show how symmetry works. Nonetheless,
points are better used in rules. It’s calculating with shapes that makes a real difference.
There are addition rules like these