B. 2:Angle
Press
.
Use
and
to select the menu of choice. 
Not all options are given in the entry format. Options that are used frequently will be included, but others are omitted from the table. For a complete format listing, you can check the TI89 manual. Results in complex mode are not covered. They can be found in the manual.
Operation

Entry Format

Explanation

Screen


In Radian angle mode,
recognizes the expression as being a degree expression. 

In Degree angle mode,
recognizes the expression as being a radian expression. 

3:P>Rx 
P>Rx(r expression,
expression) 
Used in conversion
of polar coordinates to rectangular coordinates . This will convert the polar to the equivalent rectangular xcoordinate. 

4:P>Ry  P>Ry(r expression,
expression) P>Ry(r List, List) P>Ry(r matrix, matrix) 
Used in conversion
of polar coordinates to rectangular coordinates. This will convert the polar to the equivalent rectangular ycoordinate. 

5:R>Pr 
R>Pr(x expression, y expression) 
Returns the equivalent rcoordinate of the (x,y) pair arguments. 

6:R>P  R>P(x
expression, y expression) R>P(xList, yList) R>P(xMatrix, yMatrix) 
Returns the equivalent coordinate of the (x,y) pair arguments. 

7: Also 
[radius, angle]  Returns coordinates as a vector.  
8:DMS  expression>DMS list>DMS matrix>DMS 
Interprets the argument
as an angle and displays the equivalent DMS number. 

9:>DD  number>DD list>DD matrix>DD 
Returns the decimal
equivalent of the argument. The symbols for degrees, minutes, seconds are found by pressing: and and . 