Angles are applied in two primary modes: degrees and radians. Set up the mode
accordingly. Press MENU 1 to access the RUN-MAT
screen.
Warning Most calculator
errors in trigonometry occur because the calculator is in the wrong angle set
up mode.
To
set up the angle mode, press CTRL
SETUP (located above the F3 key). Navigate to Angle. Press F1
to select Deg for degree mode or press F2 to select Rad for radian mode.
We also recommend that Display be set to Normal (press the thumb pad down arrow
several times to locate Display). After set up, press EXE
to return to the RUN-MAT home screen.
Degree
Mode
In degree mode, angles can be entered as decimal degrees (DD) or degress-minutes-seconds
(DMS). For example, to evaluate tan(17°43'25"), press
tan (
1 7 OPTN F6 (to see more options)
F3
(to access ANGL)
4 (to select a DMS entry)
4 3 F3 4
2 5 F3 4
) EXE
While in degree mode, you can convert radians to degrees. For example, to convert
1.23 radians to degrees, press
1 . 2 3
F3 (to access ANGL) [if needed, OPTN F6 to see ANGL]
2 (to select 2:r )
EXE [Hence, 1.23r 
70.4738°.]
Radian Mode
Set the calculator to RADIAN mode. Radian angles can then be entered as ordinary
numbers. For example, to evaluate sin(π/4), press
sin
(
SHIFT π (located above
the EXP key)
4 ) EXE
While in radian mode, you can convert degrees to radians. Enter the angle using
the DMS symbols. For example, to convert 17°43'25" to radians, press
1 7 OPTN F6 F3 4
4 3 F3 4
2 5 F3 4
EXE This converts DMS to DD.
SHIFT Ans (located above the (-) key)
x SHIFT π 1 8 0 EXE
This converts DD to radians.
Hence, 17°43'25"" .309 radians.