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HP 25 User Manual

HP 25
132 pages
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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 di
ame
ter
of
21
feet.
If
hi
s
appetite
were
equal
to
the
task,
how
many s
quare
feet
of
pizza would Mulligan
.
have
to
devour
in
order
to
consume
all
of
the
world's
largest
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 results
in
the automatic
memory
stack
to lift.

Table of Contents

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HP 25 Specifications

General IconGeneral
Power SourceRechargeable battery pack
Programming Steps49
Release Year1975
FunctionsTrigonometric, logarithmic, statistical
TypeScientific
Dimensions148 x 80 x 14 mm

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