Sharp EL-9600 User Manual page 86

NAME _____________________________________________________ CLASS __________ DATE __________
9.2
AREA OF A TRIANGLE
1. Continue with the formula from Blackline Master 9.1. Press 2ndF
touch A METHOD, and double touch 3 Graphic to choose the Graphic solver.
2. To start the problem from the beginning, set A to 0. Move the cursor to
the A variable and press 2ndF
range screen.
3. Since area is always nonnegative, 0 could be used for BEGIN. Enter END
a value that you do not expect area to exceed, say 25. (A little bit of
estimation helps here! If your value for END is too small, increase it and
try again.)
4. Press 2ndF
is drawn and the solution is obtained.
5. Enter Heron's formula, A =
following: ALPHA
S – ALPHA
S – ALPHA
6. Note that the square root symbol extends over the entire right hand side of
the equation, automatically grouping the expression under it.
7. You could enter the semiperimeter, S =
in the SOLVER, but it is probably easier to find the value of S in the
computation mode and then use Heron's formula in the SOLVER.
Press ENTER to view the variable list.
8. Use Heron's formula to solve some area problems.
82 Blackline Masters/TRIGONOMETRY USING THE SHARP EL-9600
EXE to see the Graphic solver variable
EXE and an autoscaled graph of the two sides of the equation
[S(S-X)(S-Y)(S-Z)], press CL , and type the
A ALPHA =
) (
X ALPHA
) .
Z
2ndF ALPHA
S – ALPHA Y
1
(X + Y + Z), in a separate formula
2
SOLVER ,
(
S ALPHA
) (
ALPHA