Sharp el-9950 - Page 40

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Chapter 2: Operating the Graphing Calculator
Rectangular/polar coordinate conversion
This calculator is equipped with rectangular coordinates and polar
coordinates conversion capabilities.
θ
r
x
y
Rectangulartopolarcoordinateconversionfunctions
Conversionformulas:
r = (x
2
+ y
2
)
1/2
,
θ
=
tan
-1
(y/x)
Polartorectangularcoordinateconversionfunctions
Conversionformulas:
x = rcos
θ
, y = rsin
θ
3 xy
→
r(
xy
→
r( x coordinate, y coordinate )
Returnspolarcoordinateradius
valuefromX-Yrectangular
coordinates.
4 xy
→
θ
( xy
→
θ
( x coordinate, y coordinate )
Returnspolarcoordinate
θ
valuefromX-Yrectangular
coordinates.
The following ranges are used to
find
θ
.
Degree mode: 0
≤
|
θ
|
≤
180
Radianmode:0
≤
|
θ
|
≤
2
π
Gradientmode:0
≤
|
θ
|
≤
200
5 r
θ
→
x( r
θ
→
x(
r coordinate ,
θ
coordinate )
ReturnsrectangularcoordinateX
valuefromr-
θ
polar coordinates.
6 r
θ
→
y( r
θ
→
y(r coordinate,
θ
coordinate)
ReturnsrectangularcoordinateY
valuefromr-
θ
polar coordinates.