HP -67 Owner's Handbook Manual page 26

22 Meet the HP-67
Running the Program. To run the program to find the area of any
sphere from its diameter:
1. Slide the W/PRGM-RUN switch wrram llIMIRuN back to
RUN.
2. Key in the value of the diameter.
3. Press to run the program.
When you press #3 , the sequence of keystrokes you loaded is auto-
matically executed by the calculator, giving you the same answer you
would have obtained manually.
For example, to calculate the area of Ganymede, with a diameter of
3200 miles:
Press Display
3200 3200.
) 32169908.78 Square miles.
With the program you have loaded, you can now calculate the area
of any of Jupiter's moons—in fact, ofany sphere—using its diameter.
You have only to leave the calculator in RUN mode and key in the
diameter of each sphere for which you want the area, then press ) .
For example, to compute the surface area of Jupiter's moon Io, with
a diameter of 2310 miles:
Press Display
2310 16763852.56 Square miles.
For the moons Europa, diameter 1950 miles, and Callisto, diameter
3220 miles:
Press Display
1950 11945906.07 Area of Europa in square
miles.
3220 32573289.27 Area of Callisto in square
miles.