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Angle Measure
Trigonometric functions, for example, require arguments representing plane
angles. The calculator provides three different Angle Measure modes for
working with angles, namely:
• Degrees: There are 360 degrees (360
°
) in a complete circumference.
• Radians: There are 2
π
radians (2
π
r
) in a complete circumference.
• Grades: There are 400 grades (400
g
) in a complete circumference.
The angle measure affects the trig functions like SIN, COS, TAN and
associated functions.
To change the angle measure mode, use the following procedure:
•Press the H button. Next, use the down arrow key, ˜, twice.
Select the Angle Measure mode by either using the \ key (second
from left in the fifth row from the keyboard bottom), or pressing the
@CHOOS soft menu key. If using the latter approach, use up and down
arrow keys, —˜, to select the preferred mode, and press the !!@@OK#@
soft menu key to complete the operation. For example, in the following
screen, the Radians mode is selected:
Coordinate System
The coordinate system selection affects the way vectors and complex
numbers are displayed and entered. To learn more about complex
numbers and vectors, see Chapters 4 and 8, respectively, in this guide.
There are three coordinate systems available in the calculator: Rectangular
(RECT), Cylindrical (CYLIN), and Spherical (SPHERE). To change
coordinate system:
•Press the H button. Next, use the down arrow key, ˜, three times.
Select the Coord System mode by either using the \ key (second
from left in the fifth row from the keyboard bottom), or pressing the
@CHOOS soft menu key. If using the latter approach, use up and down
arrow keys, —˜, to select the preferred mode, and press the !!@@OK#@
SG49A.book Page 14 Friday, September 16, 2005 1:31 PM