HP 48gII User Manual Page 248

Graphing calculator.

5[ a ]
a:5 is listed in the top left corner of the display.
3[ b ]
b:3 is listed in the top left corner of the display.
5[ c ]
c:5 is listed in the top left corner of the display.
To solve for the angles use:
„[ α ]
Calculator reports
72.5423968763
Note: If you get a value that is larger than 180, try the following:
α
]
10[
„ [ α ]
Next, we calculate the other two values:
„ [ β ]
„ [ γ
]
You should have the values of the three angles listed in stack levels 3 through
1. Press + twice to check that they add indeed to 180
Press L to move to the next variables menu. To calculate the area use:
„[ A
]. The calculator first solves for all the other variables, and then
7.15454401063.
finds the area as A:
Note: When a solution is found, the calculator reports the conditions for the
solution as either Zero, or
calculator has difficulties finding a solution.
Pressing „@@ALL@@ will solve for all the variables, temporarily showing the
intermediate results. Press ‚@@ALL@@ to see the solutions:
, and shows the result
Solving for α
.
Re-initialize a to a smaller value.
Calculator reports
Solving for α
The result is β:
34.9152062474
The result is γ:
72.5423968763
Sign Reversal
. Other messages may occur if the
α:
.
.
o
.
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