Sharp EL-9600 User Manual page 40

Next type 15 for x, the length of the side opposite the 95°, and press ENTER .
Enter 48 for B in the same manner. Solve for y by positioning the blinking cursor
over the y and press 2ndF
Use the fact that the sum of the angles in any triangle is 180° to find 37° as the
measure of the angle opposite side z. You can now apply methods in Chapter 7
to edit the current equation to one involving a known side and side z, say
sin A
sin C
=
X
Z
y = z. In either case, you should find z = 9.06.
This problem could also be solved using the Graphic Solver. Press 2ndF
SOLVER , touch A METHOD, double touch 3 Graphic to choose the Graphic
Solver. Enter the known quantities for the first part of this example: angle A
measures 95°, side x is of length 15, and angle B measures 48°. (To start the
problem from the beginning, enter 0 for y). Use
the unknown quantity, y. To begin the solution process press 2ndF
you will see:
You must enter the range values for the unknown (from BEGIN to END) within
which you expect to find the solution. Let the BEGIN = 5 by pressing 5
Enter a value for END that you do not expect y to exceed, say 25, by pressing
2 5 ENTER . Press 2ndF
showing graphs of the left and right sides of the current equation.
The calculator will now display a blinking box in the upper right-hand corner of
the viewing screen while it looks for the intersection of the two graphs. If one is
found, the solution is displayed at the bottom of the screen.
36 Law of Sines and Law of Cosines/TRIGONOMETRY USING THE SHARP EL-9600
EXE . The y turns out to be about 11.19.
, or you can work with the current equation using B = 37 and
EXE and an autoscaled plot will be drawn
to position the cursor over
EXE and
ENTER .