curious still. For instance, if we make a rectangle (Fig. 251) such that the two sides
Fig. 251. Fig. 252.
are in the ratio of 1ã₤:ã₤ãÿ£¢2, it is obvious that, on doubling it, we obtain a precisely similar figure; for 1ã₤:ã₤ãÿ£¢2ã₤::ã₤ãÿ£¢2ã₤:ã₤2; and {511} each half of the figure, accordingly, is now a gnomon to the other. Another elegant example is when we start with a rectangle ( A ) whose sides are in the proportion of 1ã₤:ã₤ô§(ãÿ£¢5ã₤ãã₤1), or,