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Function Keys
53
Squaring
To square a number
in the
displayed
X-register
,
press
III
~.
For example,
to
find the square of 45:
Press
Display
45
III
~
I
2025.00
To
find
the square
of the result:
Press
Display
I
4100625.00
I
Using Pi
The value
7T
accurate to
10
places (3.141592654)
is
provided
as
a
fixed
constant
in the HP-25
.
Merely press
III
0
whenever
you
need
it
in
a
calculation. For
example
,
to calculate
37T:
Press
Display
3
1lI
0
0
,-I
_
9._
42
_
_
~
Example: Trencherman
Buck Mulligan
looks into
a
recent
edi-
tion of the
Guinnes
s
Book
of
Records and finds
that the largest
pizza
ever baked
had
a
diame
ter
of 21
feet. If hi
s
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
large st
pizza
?
Press
Display
211mim
1
21.00
2
El
1
10.50
1lI
0
1
110.25
III
0
1
3.14
o
~I
~ 3=: 4'='
6.~
3==
6==;
Square
feet
of
pi
zza
.
Pressing
III
0
causes the
re sults in the
a
utomatic memory
stack
to
lift.
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