HP 50G, Руководство пользователя

Страница: 250 / 887

Page 7-13
Let’s try a simple solution of Case I, using a = 5, b = 3, c = 5. Use the
following entries:
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
.
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 : 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
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.