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Using ° and r to specify degrees and radians, Using, 1 and 4 – Texas Instruments TI-73 EXPLORER User Manual

Page 222

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216

Chapter 11: Trigonometry

7311ENG.DOC CH 11 Trigonometry, English Julie Hewlett Revised: 05/26/98 11:12 AM Printed: 05/19/99 9:02

AM Page 216 of 12

Using

Using

¡

and

and

r

to Specify Degrees and Radians

to Specify Degrees and Radians

-

u

"

1 and 4

1 and 4

Normally, angles are interpreted according to the Angle mode

setting. However, you can specify an angle as degrees or

radians regardless of the Angle mode.
Suppose a series of trig calculations uses radians, but a few

use degrees. Rather than change from

Radian

to

Degree

Angle

mode and then back again, you can stay in the

Radian

Angle

mode and specify some angles as degrees.

In

Radian

Angle mode, calculate sin(p/3). Then, without

changing to the

Degree

Angle mode, calculate sin(60¡).

1. Select

Radian

Angle mode.

. # # " b

2. Return to the Home screen,

and clear it, if desired.

- l :

3. Enter

sin(

p

/3)

.

- u

1

- „ F

3

E b

4. Use the

¡

designator to

enter

sin(60

¡

)

.

- u

1

6 0

- u "

1

E b

Likewise, you can use

r

to specify an angle as radians in the

Degree

Angle mode.

³

60 is specified as degrees

even in Radian angle mode.

p

/3r=60

¡

.