Daily Mathematics Series 60: February 29

2 month 29 Japan XXIX

Only leap years 2 month 29 Japan . A leap year is a year that can be 400 The century of division , Or other 4 The non century year of division .

Mathematical maxims

Logic is the art of going astray with confidence .—— Maurice · Klein （Morris Kline）

Math exercises

A conical beaker , At a distance from the cup mouth 1 2 \displaystyle\frac{1}{2}