216 Chapter 11: Trigonometry
7311ENG.DOC CH 11 Trigonometry, English Julie Hewlett Revised: 05/26/98 11:12 AM Printed: 05/19/99 9:02
AM Page 216 of 12
Using Using ¡
and and

r

to Specify Degrees and Radians to Specify Degrees and Radians
-
u
"
1 and 4 1 and 4
Normally, angles are interpreted according to the Angle mode
setting. However, you can specify an angle as degrees or
radians regardless of the Angle mode.
Suppose a series of trig calculations uses radians, but a few
use degrees. Rather than change from Radian to Degree Angle
mode and then back again, you can stay in the Radian Angle
mode and specify some angles as degrees.
In Radian Angle mode, calculate sin(p/3). Then, without
changing to the Degree Angle mode, calculate sin(60¡).
1. Select Radian Angle mode.
.##"b
2. Return to the Home screen,
and clear it, if desired.
-l:
3. Enter sin(p/3).
-u1-„F3
Eb
4. Use the ¡ designator to
enter sin(60¡).
-u1
60-u"1
Eb
Likewise, you can use r to specify an angle as radians in the
Degree Angle mode.
³
60 is specified as degrees
even in Radian angle mode.
p/3r=60¡.