HP -225 Owner's Manual page 57

To convert from rectangular to polar coordinates:
1. Store the rectangular coordinates: Key in x and press [xCOORD .
Key in y and press @[yCOORD].
2. Calculate the polar coordinates: Press J[RADIUS] and/or
W(ANGLE].
To convert from polar to rectangular coordinates:
1. Store the polar coordinates: Key in r and press [j[RADIUS . Key in
6 and press [ANGLE ] .
2. Calculate the rectangular coordinates: Press [J§[xCOORD] and/or
@(coorD].
Example: Coordinate Conversions. Part 1: Convert the rectangu-
lar coordinates (10,—15) to polar coordinates.
Keys: Display: Description:
B(MoDEs] {DG}
Sets Degrees mode.
10 J§(xCOORD] x=10.0000 Stores x.
15 (*4] (»COORD »=-15.0000 Stores y.
B(RADIUS] r=18.0278 Calculates r.
B(ANGLE] 8=-56.3099 Calculates 6.
Part 2: Convert the polar coordinates (7,30°) to rectangular
coordinates:
7 B(RADIUS] r=7.0000 Stores .
30 @BANGLE 8=30.0000 Stores 6.
B8(=COORD] x=6.0622 Calculates x.
@8(coorD)
»=3.5000
Calculates y.
Part 3: Convert (6, 30°) to rectangular coordinates:
6 @(RrADIUS] r=6.0000 Stores r. (30° is still
stored in 6.)
8(xCoorp] x=5.1962 Calculates x.
@(>CooRrD]
»=3.0000
Calculates y.
3: Numeric Functions 49