HP 39gII User Manual page 154

Set angle
measure
NOTE
Specify the
known values
Solve
144
Make sure that your angle measure mode is appropriate.
By default, the app starts in degree mode. If the angle
information you have is in radians and your current angle
measure mode is degrees, change the mode to degrees
before running the solver. The Degree menu key is a
toggle. Press it once to see it change to Radians for
angles expressed in radians; press it again to return to
degrees.
The lengths of the sides are labeled A, B, and C, and the
angles are labeled α, β, and δ. It is important that you
enter the known values in the appropriate fields. In our
example, we know the length of two sides and the angle
at which those sides meet. Hence if we specify the lengths
of sides A and B, we must enter the angle as δ (since δ is
the angle where A and B meet). If instead we entered the
lengths as B and C, we would need to specify the angle
as α. The illustration on the display will help you
determine where to enter the known values.
2. Using the arrow keys, move to a field whose value
you know, enter the value and press
Repeat for each known value.
4 E
6 E>
30 E
3. Press . The
solver calculates and
displays the values of
the unknown
variables. As the
illustration at the right
shows, the length of the unknown side in our example
is 3.22967. The other two angles have also been
calculated.
Note: to clear all values and solve another problem,
S
press
CLEAR
.
E
or .
Triangle Solver app