39
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.