Speaking of polygonical manholes, does anyone know where to get a copy of turtle logo for older macs? Or, perhaps even better, a cartridge version for one of the 6502 machines (Atari, c64, etc.)? (This is for my niece

is probably about ready to at least watch logo pgms.) At 01:06 PM 1/29/98 GMT, you wrote: You may have triangular manholes (and, I assume, covers), but I disagree with the statement that they won't fall in. (Mind you, they may not be *likely* to, but that doesn't mean they won't.) Consider any regular (is that the right term?) polygon (i.e., all sides, angles are equal). For an odd number of sides: imagine a line from an angle to the midpoint

the opposite side. Imagine a second line, from that same angle to either end of the opposite side. You've just created a right triangle

lines, half the opposite side) wherein the first imaginary line *must* be shorter than your second line. Put your first line parallel to the

line up the manhole vertically above the corresponding second line on the manhole, and drop. For an even number of sides: Do the same thing, only the reverse

angle and connected side, etc.) Oh, make sure there's no one down below before dropping *please* --------------------------------------------------------------------- O- Uncle Roger "There is pleasure pure in being mad roger(a)sinasohn.com that none but madmen know." Roger Louis Sinasohn & Associates San Francisco, California http://www.crl.com/~sinasohn/