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The Compleat User RPL Encyclopedia


(“pi”)

  'π' (when both flags -2 and -3 are clear)    
      3.14159265359 (when either flag -2 or -3 are set)
Keyboard Access:
  HP-28: the  key
  HP48S: LS-SPC
  HP48G: LS-SPC
         MTH NXT CONST
HP49/50: LS-SPC
         LS-MTH NXT CONST
         « CONSTANTS »

Pi constant function: Returns the symbolic constant or its numerical representation, 3.14159265359.  is defined as the ratio of any circle’s circumference to its diameter. In simple English, the distance around any circle is exactly  times the distance across it.

Since the radius of a circle is half its diameter, the circumference is  radii (radiuses) in length, hence 360° =  radians, as demonstrated by .

Fascinating Factoid:
HP49/50:     

Another Fascinating Factoid:  returns the first twenty four digits of , split between two stack levels.

Note that is recognized by some functions and is handled exactly.
Example (in Exact mode with flags -2 and -3 clear):
    0 (exactly)
    -2.06761537357E-13

See also:

BYTES:
: 2.5
: 5.5