Squaning " O; Using Pi - HP -25 Owner's Handbook Manual

Squaring
To square a number in the displayed X-register, press [}
. For example, to find the square of 45:
Press Display
To find the square of the result:
Press Display
B 4100625.00
Using Pi
The value 7 accurate to 10 places (3.141592654) is provided as
a fixed constant in the HP-25. Merely press [ whenever
you need it in a calculation. For example, to calculate 37:
Press Display
3@
Example: Trencherman Buck Mulligan looks into a recent edi-
tion of the Guinness Book of Records and finds that the largest
pizza ever baked had a diameter of 21 feet. If his appetite were
equal to the task, how many square feet of pizza would Mulligan
have to devour in order to consume all of the world's largest
pizza?
Area = 77 d =1 21
2 2
Press Display
21 I
2 @
o=
B [5
x] Square feet of pizza.
Pressing [21 causes the results in the automatic memory
stack to lift.