HP 48g Graphing Calculator - Manual (Page 125)

Converting Angular Units
Planar and solid angles are associated with actual units. However,
although this distinguishes them from scalars {dimensionless
numbers), the HP 48 allows you to convert between units of angle
and scalars. The conversion will interpret the scalar according to the
current angle mode setting (degrees, radians, or grads).
Unit Symbol Definition Value
Arcmin
Arcsec
Degree
Grad
Radian
Steradian
r" C
\ ‘ \
1 r I V 21600 unit circle
Vi 296000 unit circle
Vseo unit circle
V 400 unit circle
^
/
2
TT unit circle
^ /
4
TT unit sphere
2.90888208666 x 10'^ r
4.8481368111 X 10-® r
1.74532925199 x lO'^ r
1.57079632679 x lO'^ r
1 r
1 sr
10
Calculating with Units
The HP 48 lets you execute many arithmetic operations with unit
objects, just as you would with real numbers;
■ Addition and subtraction (dimensionally consistent units only)
m Multiplication and division
■ Inversion
■ Raising to a power
■ Percentage calculations (dimensionally consistent units only)
■ Comparisons of values (dimensionally consistent units only)
■ Trigonometric operations (planar angular units only)
Several additional math operations are available, but work only on the
number part of the unit object.
1. Enter the unit objects.
2. Execute the commands.
Units are automatically converted and combined during the
calculation, though certain operations require dimensionally consistent
Unit Objects 10-7