173.--MRS. PERKINS'S QUILT.

[Illustration]

It will be seen that in this case the square patchwork quilt is built up

of 169 pieces. The puzzle is to find the smallest possible number of

square portions of which the quilt could be composed and show how they

might be joined together. Or, to put it the reverse way, divide the

quilt into as few square portions as possible by merely cutting the

stitches.

Amusements in Mathematics · 第 202 / 970 题