Radio Shack TRS-80 PC-3 Owner's Manual page 160

1 RADIAN
Abbreviations: RAD., RADI., RADIA.
See also: DEGREE and GRAD
Purpose
The RADIAN verb is used to change the form of angular values to radian form.
Use
The PC-3 Pocket Computer has three forms for representing angu lar values - decimal degrees, radians, and gradient. These forms
are used in specifying the arguments to the SIN, COS, and TAN functions and in returning the results from the ASN, ACS, and
ATN functions.
The RADIAN function changes the form for all angular values to radian form until a DEGREE or GRAD verb is used. Radian form
represents angles in terms of the length of the arc with repect to a radius, i.e., 36lil
o
is 2PI radians, since the circumference of a
circle is 2 PI times the radius.
Examples
10 RADIAN
20 X
=
ASN 1 X now has a value of 1.57lil796327 or P1/2, the Arcsine of 1.
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