When first learning about the
Trigonometric Ratios, you will be working in Degree mode.
The calculator will default to Radian mode, so .... |
|
start by setting the
calculator's MODE to
Degree!!!!
 |
 |
| Note: If the
calculator is set in Radian mode and you wish to find an angle in Degrees, you can insert a
degree symbol after the number of degrees in the angle. The degree symbol is found under 2nd APPS (Angle) #1 °. Only that one entry will be calculated in Degrees -- all others will remain in Radian mode. |
|
Set
MODE
to
Degree.
|
Type entry on the Home Screen.
Hit ENTER.
 |
You may be asked to round this answer to
a specified value.
If not asked to round, state the full
screen value as the answer.
If further calculations are needed, keep
this full screen value and continue
working. |
|
| Find ∠A to the nearest degree,
given cos A = 3/5 |
To find the number of degrees in the angle, you will need to use the calculator's inverse trigonometric functions. You will find these inverse functions (sin-1, cos-1, and tan-1) "above" the keys for sin, cos, and tan.
|
Set
MODE
to
Degree.
|
On the Home Screen,
hit 2nd cos to get
the cos-1.
Type 3/5. Hit ENTER.
 |
Rounding answer to the nearest degree gives 53°. |
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