Texas Instruments TI-60 - Page 48

CHAPTER 1-6
CONVERSION KEYS
The polar system ol coordinates describes a point in terms of a line drawn
from a centre to the point It also use® a pair of numbers The first number is
the length of the line, labeled R The second is the number of degrees the
line Is from horizontal, labeled theta (0) The following shows the same point
but described as (2,60»)
The conversion from polar to rectangular coordinates and back involves some
detailed arithmetic Fortunately, the calculator can perform these calculations
To convert from polar to rectangular coordinatea, follow these steps
• Enter the R value
Preaa I WilTl
• Enter the t» value
Press ing : [P-R]
The y-coorchnate is displayed
Press »**y
The *-coordinate is displayed
Example
Convert the polar coordinates (r - 10. If - -45*) to rectangular coordinates
Press Display Comments
ISHT! ON 0 Clear calculator
10 r«t»y'| 48 [i/- Enter r and 6
2nd] [P-R] -7.071067812 Find y coordinate
»^-y 7071067812 Find x coordinate
!*S£1 -7.071067812 Restore y coordinate
The polar coordinates (10. -45°) convert to rectangular coordinates
(7 071067812, -7 071067812)
Note that the x and y indicators are displayed to identity the x and y
coordinates, respectively
To convert from rectangular to polar coordinates, follow these steps
• Enter the x-coordinate
Press fifoyl
• Enter the y-coordinate
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