I. Menu Keys  Keys that offer choices
G. ANGLE
The ANGLE menu is quite versatile and is used with trigonometric functions and for conversions between polar and rectangular coordinates.
The Radian/Degree mode setting will affect the output so you need to check the mode before using these operators.
1: (degree notation) will designate an angle or a list of angles as being in degree mode no matter what the current mode setting is. So, you can convert from radian to degree mode using this key instead of changing the mode.
Example: With the calculator in radian mode, evaluate and then evaluate sin 30 radians. To access this option press 1 after you enter the 30.
2:' (DMS minute notation) is used in conjunction with the degree symbol () and the symbol for seconds (") to enter an angle in DMS form. To enter the seconds symbol, (") press . You must still use the degree symbol at the end of the entry if the calculator is in radian mode. Note the second window below for a demonstration of this.
Degree mode.


Radian mode.

3: (radians) will designate an angle or a list of angles as being in radian mode no matter what the current mode setting is. So, you can convert from degree to radian mode using this key instead of changing the mode.
Example: Put your calculator in degree mode and perform the calculations shown below. To access this option, press 3. Notice that you can convert a radian measure to degree measure as well as evaluating a trig function.
4: (degree/minute/second) displays an answer in DMS format but the mode must be in DEGREES or else the answer will not be interpreted as degrees, minutes and seconds. is to be used only at the end of a line. To access this option, press 4.
5: ( converts rectangular coordinates to polar coordinates and returns the value of r.
6: ( converts rectangular coordinates to polar coordinates and returns the value of .
You need to make sure that the mode is set to the desired measurement mode.Example: Convert the point with rectangular coordinates of (2,4) to polar form in both degree and radian mode.
Degree Mode

Enter
5 and then the 

Radian Mode

Enter
5 and then the
coordinates to find r. Enter 6 and then the coordinates to find the angle. 
7: ( converts polar coordinates to rectangular coordinates and returns the value of x.
8: ( converts polar coordinates to rectangular coordinates and returns the value of y.
You need to make sure that the mode is set to the desired measurement mode.Example: With the calculator in degree mode convert the point with polar coordinates to rectangular form.
Degree Mode

Enter
7 and then 