0.1, 0.2, 0.3 and 0.4
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All negative numbers are less than pi.
The first four numbers in pi are 3.141. Backwards, the first four numbers are 141.3. Pi has been calculated to over a million digits.
3*pi/4, 7*pi/4, 11*pi/4 and 15*pi/4 radians or2.3562, 5.4978, 8.6394 and 11.7810 radian (approx).
Sure; for example, 10 + pi is irrational, 10 - pi is irrational. Both are positive. If you add them, you get 20.
The fraction 22/7 is close to PI for four significant digits.