HP 39gs_40gs_Mastering The Graphing Calculator_English_E_F2224-90010

Since this is not a right triangle, the first step is to ensure that is not selected, as is shown right. Any of
the three angles
α
, β or
δ
can be used to represent the 115
o
angle.
In this case I will use
δ
for no other reason than that it is at the top of
the illustration, just as it is in the diagram of the triangle. This means that
the 15 cm goes into the
A field and the 7 cm into the B field. Enter
those values, using the arrow keys to move from one to another. The
result should be the screen shown right.
will result in the remaining 3 values
being filled in, as shown.
Pressing the button labeled
The calculated values are highlighted for convenience.
12 cm
E
E
x
x
a
a
m
m
p
p
l
l
e
e
2
2
Find the length of the hypotenuse for the triangle shown right.
25 cm
Since we don’t want the sizes of the angles it doesn’t really matter what angle mode the aplet is set to. If you
worked the previous example then it is probably still in degree mode.
Press the
button to change the screen into the right triangle
format as shown right. Pressing
SHIFT CLEAR will remove the
remaining values from the previous problem.
Use the arrow keys to move to the
A and B fields and enter the values of
25 cm and 12 cm respectively. Then press
.
The result should be as shown right, giving a length for the hypotenuse
of 27.73 cm. In the example screen I have also pressed the
button (with the highlight on
C) so that I can see more than 2 decimal
places.
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