Wednesday, August 12, 2009


172 = 22 x 43.

172 has a unique representation as a sum of three squares: 172 = 62 + 62 + 102.

172 is 444 in base 6.

Each internal angle of a regular 45-sided polygon is

172 is the maximum number of regions into which 18 lines divide the plane. Hence, 172 is a member of the lazy caterer's sequence, which describes the maximum number of pieces of a circle (a pancake or pizza) that can be made with a given number of straight cuts. For example, three cuts across a pancake will produce six pieces if the cuts all meet at a common point, but up to seven if they do not.

Ethanol (ethyl alcohol) boils at
172 oF under standard conditions.


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