Section 6: Functions82
Squaring
To square a number in the X-register, execute the X2 and when you execute the function from the display the name is X 2 (using the up arrow, the shifted function on the ENTER  key, in ALPHA mode).
  Keyboard execution: X2
 
  Display execution: X 2
For example, find the square of 27 using the keyboard X2 function:
Keystrokes Display    
27 g X2 
  729.0000    
   
Now, find the square of that number using the display execution form:
Keystrokes Display    
 
  729.0000    
   
XEQ 
  XEQ _ _    
   
ALPHA 
       
   
X g   g 2 
       
  The up-arrow is on the shifted N key in ALPHA mode (on ENTER  key).
ALPHA 
  531,441.0000    
   
Using Pi
The value of pi accurate to 10 places (3.141592654) is provided as a fixed constant in your HP-41C. Merely press g   on the keyboard or execute PI form the display whenever you need it in a calculation.
  Keyboard execution:  
  Display execution: PI
For example, calculate the surface of Ganymede, one of Jupiter’s 12 moons, using the formula A = πd2. Ganymede has a diameter (d) of 3200 miles.
Keystrokes Display    
3200
  3200 _    
   
g X2 
  10,240,000.00    
   
g   
  3.1416    
  The quantity pi.
 ×  
  32,169,908.78    
  Area of Ganymede in square miles.