Texas Instruments TI-83 PLUS - Manual (Page 101)

TI-83 Plus Math, Angle, and Test Operations 98
For example, enter for 30 degrees, 1 minute, 23 seconds. If the angle
mode is not set to
Degree , you must use ¡ so that the TI-83 Plus can
interpret the argument as degrees, minutes, and seconds.
Degree mode Radian mode
¡ (Degree)
¡ (degree) designates an angle or list of angles as degrees, regardless of
the current angle mode setting. In Radian mode, you can use ¡ to convert
degrees to radians.
value ¡
{ value1 , value2 , value3 , value4 , ... , value n } ¡
¡ also designates degrees (D) in DMS format.
' (minutes) designates minutes (M) in DMS format.
" (seconds) designates seconds (S) in DMS format.
Note: " is not on the ANGLE menu. To enter " , press ƒ [ г ].