1. 4.1 – Angles on the TI-83+ calculator
MODE
Two calculator modes –
degrees
radians
(use arrow keys to move cursor down and across)
When the cursor is blinking over your selected mode:
ENTER
To exit mode:
2nd, QUIT
Math 97 D.Sluys

2. 2nd ANGLE ALPHA “ Entering DMS form Example: 64 degrees (D)
32 minutes (M)
47 seconds (S)
For degrees and minutes use :
2nd ANGLE
For minute sign use:
ALPHA “
(the “ is above the + key)

3. Express 64.54 degrees in radians
180 degrees = radians
Convert degrees to radians using ratios
Express 30 degrees in radians
As a number
As a multiple of
Express degrees in radians

4. decimal degrees to radians in radian mode
180 degrees = radians
Calculator will convert
decimal degrees to radians
in radian mode
{In degree mode need to use ratios.}

5. 180 degrees = radians
Convert radians to decimal degrees using ratios

6. Calculator will convert radians to decimal degrees and/or DMS
180 degrees = radians
Calculator will convert
radians to decimal degrees and/or DMS
in degree mode
{in radian mode – use ratios}

7. DMS form conversions:
In degree mode, convert
decimal degree to DMS, and
radians to DMS (need to stipulate radians)

8. (omit degree sign to get correct answer) But not radians to DMS
In radian mode, convert
decimal degree to DMS,
(omit degree sign to get correct answer)
But not radians to DMS
(note wrong answers)

9. RADIAN mode DEGREE mode DMS form to other forms DMS form to radians
DMS to radians
(using ratios)
DMS to decimal degrees
(angle menu)
(short-cut)

10. Remember - every
needs to be
by a good