90
Program code
Key operation
S=‰(T(T-A)(T-B)(T-C))
;
S
;
=
@
*
(
;
T
(
;
T
-
;
A
)
(
;
T
-
;
B
)
(
;
T
-
;
C
)
)
e
Print S
i
0
;
S
e
End
i
5
e
Label ERROR
i
6
@
a
ERROR
;
e
Print”NO TRIANGLE
i
1
@
a
NO
s
TRIANGLE
;
e
Wait 1
i
3
1
e
Print”REENTER
i
1
@
a
REENTER
;
e
Goto START
i
9
@
a
START
;
e
Example
Obtain the area of the triangle with the side lengths of 20 cm (A), 35 cm (B)
and 40 cm (C).
4.
Press
j
to return to the PROG mode menu.
5.
Press
0
, select the program ‘HERON’
and press
e
.
• If the values you enter do not satisfy the
conditions to make a triangle (e.g. A + B >
C where A, B, C are the side lengths), the program prompts you to re-
enter the values from the beginning. If you wish to stop the program,
press
j
.
6.
Enter 20 for A, 35 for B and 40 for C.
Result
The area of the triangle is approximately 350
cm
2
.
HERON :NORMAL
SIDE LENGTHS
A=?
40
S=
349.944192
Chapter 8: Application Examples
Содержание EL-5230
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