HP 48gII - Manual (Page 248)

Page 7-14
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 Solving for α , and shows the result α:
72.5423968763 .
Note: If you get a value that is larger than 180, try the following:
10
[ α ] Re-initialize a to a smaller value.
„ [ α ] Calculator reports Solving for α
Next, we calculate the other two values:
„
[ β ] The result is β: 34.9152062474 .
„ [ γ ] The result is γ: 72.5423968763 .
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
o .
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
finds the area as A: 7.15454401063.
Note: When a solution is found, the calculator reports the conditions for the
solution as either Zero, or
Sign Reversal . Other messages may occur if the
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: