Casio fx-991ES PLUS User Manual

Rectangular-Polar Coordinate
Conversion
Pol converts rectangular coordinates to polar coordinates, while Rec
converts polar coordinates to rectangular coordinates.
(1) Rectangular Coordinates (Rec)
(2) Polar Coordinates (Pol)
Specify the angle unit before performing calculations.
The calculation result for r and θ and for x and y are each assigned
respectively to variables X and Y.
Calculation result θ is displayed in the range of -180° < θ ≦ 180°.
Example 1: To convert rectangular coordinates (√
2, √2) to polar
coordinates (Angle unit: Deg)
(MthIO-MathO)
(Pol)
2 (,) 2
r = 2, θ = 45
(LineIO)
(Pol) 2 (,) 2
r = 2
θ = 45
Example 2: To convert polar coordinates (√2, 45°) to rectangular
coordinates (Angle unit: Deg)
(MthIO-MathO)
(Rec) 2 (,) 45 X = 1, Y = 1
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Casio fx-991ES PLUS Specifications

General

Type	Scientific
Cover	No
Form factor	Desktop
Control type	Buttons
Product color	Gray
Digits	15 digits
Display type	Dot-matrix
Display resolution	96 x 31 pixels
Display number of lines	10 lines
Storage media type	Not available
Battery life	3 year(s)
Battery type	LR44
Power source	Battery/Solar
Number of batteries supported	1
Symbolic notation	Square root
Conversion between	Decimal, Fraction, Percent
Convert angles from degrees to	Gradian, Radian
Random number/integer generator	Yes

Weight and Dimensions

Depth	162 mm
Width	80 mm
Height	11.1 mm
Weight	95 g